Parts of my text disappears!

Question

I am using WinEdt 10 (64 bit). Today, I observed a strange behavior that I cannot understand. I would appreciate if anyone could explain why parts of my text would disappear due to a grammatical error in my text!

When I compile my text that has a grammatical error at the end of the last sentence, parts of my text disappears in the output pdf (the figure below shows a snapshot of my latex file with a duplicate word "to" at the end and its pdf output which is missing parts of its second line):

When I fix the grammatical error by deleting the duplicate word "to", the disappeared part shows up! Can anyone understand why winedt/latex behaves this way?

For clarification: Lines in pdf snapshots are end-of-page and header lines, so they are not parts of the text.

Answer 1

I had the same problem in my document (and sadly also cannot upload a MWE) and "solved" it as suggested by Salivan in a comment:

Change the spacing a little

Even though it is not a real solution, but only fights the symptoms, it was the only way I could get a correct PDF.

In my case it was enough to replace : (colon, space) by :\ (colon, backslash, space) in the document, which changes the spacing only very little.

Details

For anyone interested in the problem, I put my preamble here. I removed all lines, where I'm 100% sure, that they're not related to the problem, like \newcommand, \tikzstyle, ... . Since the problem disappears with the slightest change, the preamble is still quite large.

As described in the preamble, commenting out the line \newcounter{unusedCounter} "resolves" the problem. The counter is nowhere else used in the code.

The compilation log-file in the buggy case shows for the last counter of the bibtex-part: \c@cbx@tempcntd=\count512

Maybe someone has an idea, whether this could mean something. I mean, a high powers of 2 that appears at the same time as a problem could very well be related to that problem. Still, I changed some other lines that led to a compilation where also \c@cbx@tempcntd=\count512, but the pdf-output was correct.

The preamble:

\documentclass[11pt, a4paper, twoside, cleardoublepage=plain, openright, hyphens]{scrbook}
\usepackage{etex}
\usepackage[utf8]{inputenc}
\usepackage[russian, ngerman, main=english, australian]{babel}
\usepackage[cmex10]{amsmath}
\usepackage{algcompatible}
\usepackage{algorithm}
\usepackage[noend]{algpseudocode}
\usepackage{subcaption}
\usepackage{amssymb}
\usepackage{blindtext}
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{tikz}
\usepackage[normalem]{ulem}
\usetikzlibrary{shapes,arrows,fit,calc}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{backgrounds,calc,circuits.logic.US,positioning,intersections}
\usetikzlibrary{patterns, patterns.meta}
\usetikzlibrary{decorations.pathreplacing,angles,quotes}
\usetikzlibrary{shapes.geometric}
\usepackage{circuitikz}
\usepackage{graphicx}
\usepackage{makecell}
\usepackage{xspace}
\usepackage{arydshln}
\usepackage{mathtools}
\usepackage[usestackEOL]{stackengine}
\usepackage{scalerel}
\usepackage{titletoc}
\usepackage{enumerate}
\usepackage{lmodern}
\usepackage{bibentry}
\usepackage{multirow}
\usepackage{booktabs}
\usepackage[official]{eurosym}
\usepackage{amsthm}
\usepackage{soul}
\usepackage[most]{tcolorbox}
\usepackage[T1]{fontenc}
\usepackage{pifont}
\usepackage{pdftexcmds}
\usepackage{catchfile}
\usepackage{ifluatex}
\usepackage{ifplatform}
\usepackage{ifthen}
\usepackage{cancel}
\usepackage{microtype}
\usepackage{mathtools}
\usepackage{pdflscape}
\usepackage{enumitem}
\usepackage{filecontents}
\usepackage{etoolbox}
\usepackage{framed}
\usepackage{fancyhdr}
\usepackage{xpatch}
\newcommand{\pageeq}[2]{\ifthenelse{\pageref{#1}=\pageref{#2}}{p.~\pageref{#1}}{pp.~\pageref{#1}-\pageref{#2}}}
\newcommand{\Pageeq}[2]{\ifthenelse{\pageref{#1}=\pageref{#2}}{Page~\pageref{#1}}{Pages~\pageref{#1}-\pageref{#2}}}
\let\newclassictheorem\newtheorem 
\let\classicproof\proof
\tcbset{
    thmbox/.style={
        enhanced,
        breakable,
        sharp corners=all,
        fonttitle=\bfseries\normalsize,
        fontupper=\normalsize\itshape,
        top=0mm,
        bottom=0mm,
        right=0mm,
        colback=white,
        colframe=white,
        colbacktitle=white,
        coltitle=black,
        attach boxed title to top left,
        boxed title style={empty, size=minimal, bottom=1.5mm},
        overlay unbroken ={
            \draw (title.south west)--(title.south east);
            \draw ([xshift=3.5mm]frame.north west)|-%
            (frame.south east)--(frame.north east);},
        overlay first={
            \draw (title.south west)--(title.south east); 
            \draw ([xshift=3.5mm]frame.north west)--([xshift=3.5mm]frame.south west);
            \draw (frame.north east)--(frame.south east);},
        overlay middle={
            \draw ([xshift=3.5mm]frame.north west)--([xshift=3.5mm]frame.south west);
            \draw (frame.north east)--(frame.south east);},
        overlay last={
            \draw ([xshift=3.5mm]frame.north west)|-%
            (frame.south east)--(frame.north east);},
    },
    L/.style={thmbox, 
        overlay unbroken ={
            \draw (title.south west)--(title.south east);
            \draw ([xshift=3.5mm]frame.north west)|-([xshift=15mm]frame.south west);},
        overlay first={
            \draw (title.south west)--(title.south east); 
            \draw ([xshift=3.5mm]frame.north west)--([xshift=3.5mm]frame.south west);},
        overlay middle={
            \draw ([xshift=3.5mm]frame.north west)--([xshift=3.5mm]frame.south west);},
        overlay last={
            \draw ([xshift=3.5mm]frame.north west)|-([xshift=15mm]frame.south west);},
    },
    LQ/.style={thmbox, 
        overlay unbroken ={
            \draw (title.south west)--(title.south east);
            \draw ([xshift=3.5mm]frame.north west)|-([xshift=15mm]frame.south west);
            \node[anchor=east] at (frame.south east) {$\square$};},
        overlay first={
            \draw (title.south west)--(title.south east); 
            \draw ([xshift=3.5mm]frame.north west)--([xshift=3.5mm]frame.south west);},
        overlay middle={
            \draw ([xshift=3.5mm]frame.north west)--([xshift=3.5mm]frame.south west);},
        overlay last={
            \draw ([xshift=3.5mm]frame.north west)|-([xshift=15mm]frame.south west);
            \node[anchor=east] at (frame.south east) {$\square$};},
    },
}
\newcommand*\quotefont{\fontfamily{LinuxLibertineT-LF}}
\pagestyle{fancy}
\renewcommand{\chaptermark}[1]{\markboth{#1}{}} 
\fancyhead{}
\fancyhead[RO]{\slshape\nouppercase{\rightmark}}
\fancyhead[LE]{\slshape\nouppercase{\leftmark}}
\fancyfoot{}
\fancyfoot[LE,RO]{\thepage}
\newclassictheorem{hypothesis}[]{Hypothesis}
\newtcbtheorem[number within = section]{theobox}{Theorem}{thmbox,L, 
    before skip=1em plus 0.5em,
    after skip=1em plus 0.5em}{thm}
\newtcbtheorem[use counter from=theobox]{defbox}{Definition}{thmbox,L, description delimiters parenthesis, separator sign none, 
    before skip=1em plus 0.5em,
    after skip=1em plus 0.5em,
fontupper=\normalfont}{def}
%% Many more \newtcbtheorem[use counter from=theobox] 
\newtcbtheorem[]{proofbox}{Proof}{thmbox,LQ,
    before skip=1em plus 0.5em,
    after skip=1em plus 0.5em}{proof}
\newcommand{\thmCounter}{tcb@cnt@theobox}
\newclassictheorem{algo}[\thmCounter]{Algorithm}
\newclassictheorem{algo-sketch}[\thmCounter]{Algorithm Sketch}
\makeatletter
\renewcommand\thealgorithm{\thesection.\arabic{\thmCounter}} 
@addtoreset{algorithm}{\thmCounter} 
\makeatother
%%%%%%%%%%%%%%%%% % Comment the following line out to dissolve problem
\newcounter{unusedCounter}
%%%%%%%%%%%%%%%%%
\usepackage[
backend=biber,
style=ieee,
sorting=nyt,
bibencoding=utf8,
defernumbers=true,
maxnames=10,
citestyle=numeric-comp
]{biblatex}
\assignrefcontextkeyws[labelprefix=J]{J}
\assignrefcontextkeyws[labelprefix=C]{C}
\assignrefcontextkeyws[labelprefix=B]{B}
\assignrefcontextkeyws[labelprefix=W]{W}
% Pseudo-Code
\makeatletter
\def\BState{\State\hskip-\ALG@thistlm}
\makeatother
% \hyphenation, \newcommand, \tikzstyle, ...
\usepackage[bookmarks=false]{hyperref}