I had this issue twice on two of my tables. Right next to the right margin, I see a weird 'x' of which I have no clue where it comes from. I thought there might be an obvious reason why this erroneously appears. I have converted this table from excel2latex and did a few edits, but there should be no xs in it.

This is how it looks like. And this is my code
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{placeins}
\usepackage{float}
\usepackage{amsmath }
\usepackage{graphicx}
\graphicspath{ {images/} }
%%%\usepackage{lscape} % don't load both lscape and pdflscape
\usepackage{pdflscape}
\usepackage{fancyhdr}
\usepackage[paper=portrait,pagesize]{typearea}
\usepackage{natbib}
\bibliographystyle{agsm}
\usepackage{longtable}
\newcommand{\etal}{\textit{et al.}}
\usepackage{amssymb}
\usepackage{array}
\setlength\extrarowheight{2pt}
\usepackage{booktabs}% http://ctan.org/pkg/booktabs
\usepackage{calc}% http://ctan.org/pkg/calc
%%\usepackage{amsfonts} % 'amsfonts' is loaded automatically by 'amssymb'
\newcommand\mc[1]{\multicolumn{1}{c}{#1}} % handy shortcut macro
\def\sym#1{\ifmmode^{#1}\else(^{#1})\fi}
\usepackage{hyperref} % it's a good idea to load this package last
\hypersetup{
pdftoolbar=true, % show Acrobat’s toolbar?
pdfmenubar=true, % show Acrobat’s menu?
pdffitwindow=false, % window fit to page when opened
pdfstartview={FitH}, % fits the width of the page to the window
pdftitle={title}, % title
pdfauthor={Salvatore Mazzarino}, % author
pdfsubject={Subject}, % subject of the document
pdfcreator={Salvatore Mazzarino}, % creator of the document
pdfproducer={Salvatore Mazzarino}, % producer of the document
pdfkeywords={Green Networking} {Mobile Cloud} {Network Coding} {Energy}, % list of keywords
pdfnewwindow=true, % links in new window
colorlinks=true, % false: boxed links; true: colored links
linkcolor=blue, % color of internal links (change box color with linkbordercolor)
citecolor=blue, % color of links to bibliography
filecolor=magenta, % color of file links
urlcolor=cyan % color of external links
}
\begin{document}
% Table generated by Excel2LaTeX from sheet 'Sheet1'
\begin{table}[htbp]
\centering
\caption{Sensitivity checks table}
\begin{tabular}{rrrrrrrr}
\toprule
& \multicolumn{3}{c}{\textbf{2018}} & & \multicolumn{3}{c}{\textbf{2017}} \
\midrule
\multicolumn{1}{p{4.055em}}{\textbf{Model}} & \multicolumn{1}{p{4.055em}}{a} & \multicolumn{1}{p{4.055em}}{b} & \multicolumn{1}{p{4.055em}}{c} & \multicolumn{1}{p{4.055em}}{d} & \multicolumn{1}{p{4.055em}}{a} & \multicolumn{1}{p{4.055em}}{b} & \multicolumn{1}{p{4.055em}}{c} \
\midrule
\multicolumn{1}{p{4.055em}}{\textbf{Wealth }} & \multicolumn{1}{p{4.055em}}{No} & \multicolumn{1}{p{4.055em}}{ (Yes)} & \multicolumn{1}{p{4.055em}}{(Yes incl. vehicles)} & \multicolumn{1}{p{4.055em}}{(Yes incl. vehicles)} & \multicolumn{1}{p{4.055em}}{No} & \multicolumn{1}{p{4.055em}}{ (Yes)} & \multicolumn{1}{p{4.055em}}{(Yes* incl. vehicles)} \
\midrule
\multicolumn{1}{p{4.055em}}{\textbf{Housing costs}} & \multicolumn{1}{p{4.055em}}{No cap} & \multicolumn{1}{p{4.055em}}{No cap} & \multicolumn{1}{p{4.055em}}{No cap} & \multicolumn{1}{p{4.055em}}{Imputed for INR} & \multicolumn{1}{p{4.055em}}{No cap} & \multicolumn{1}{p{4.055em}}{No cap} & \multicolumn{1}{p{4.055em}}{No cap} \
\multicolumn{1}{l}{\multirow{\textbf{NTR}}} & \multicolumn{1}{c}{\multirow{\textbf{52.06}}} & \multicolumn{1}{r}{\multirow{\textbf{43.09}}} & \multicolumn{1}{c}{\multirow{\textbf{42.01}}} & \multicolumn{1}{c}{\multirow{\textbf{42.25}}} & \multicolumn{1}{c}{\multirow{\textbf{50.35}}} & \multicolumn{1}{c}{\multirow{\textbf{40.42}}} & \multicolumn{1}{c}{\multirow{\textbf{38.62}}} \
& & & & & & & \
\multicolumn{1}{l}{\multirow{\textbf{NTR }}} & \multicolumn{1}{c}{\multirow{\textbf{46.26}}} & \multicolumn{1}{c}{\multirow{\textbf{36.45}}} & \multicolumn{1}{c}{\multirow{\textbf{35.16}}} & \multicolumn{1}{c}{\multirow{\textbf{35.48}}} & \multicolumn{1}{c}{\multirow{\textbf{43.87}}} & \multicolumn{1}{c}{\multirow{\textbf{33.12}}} & \multicolumn{1}{c}{\multirow{\textbf{31.24}}} \
& & & & & & & \
\multicolumn{1}{p{4.055em}}{\textbf{Beta-error rate}} & \multicolumn{1}{c}{\multirow{\textbf{12.52}}} & \multicolumn{1}{c}{\multirow{\textbf{18.22}}} & \multicolumn{1}{c}{\multirow{\textbf{19.49}}} & \multicolumn{1}{c}{\multirow{\textbf{19.09}}} & \multicolumn{1}{c}{\multirow{\textbf{14.77}}} & \multicolumn{1}{c}{\multirow{\textbf{22.04}}} & \multicolumn{1}{c}{\multirow{\textbf{23.61}}} \
& & & & & & & \
\midrule
& \multicolumn{2}{p{8.11em}}{\textbf{Needs}} & & \multicolumn{2}{p{8.11em}}{\textbf{Income}} & \multicolumn{2}{p{8.11em}}{\textbf{Housing}} \
\midrule
\multicolumn{1}{p{4.055em}}{\textbf{∆}} & \multicolumn{1}{p{4.055em}}{\textbf{↑ +5%}} & \multicolumn{1}{p{4.055em}}{\textbf{↓ -5%}} & & \multicolumn{1}{p{4.055em}}{\textbf{↑ +5%}} & \multicolumn{1}{p{4.055em}}{\textbf{↓ -5% }} & \multicolumn{1}{p{4.055em}}{\textbf{↑ +5%}} & \multicolumn{1}{p{4.055em}}{\textbf{↓ -5%}} \
\midrule
\multicolumn{1}{p{4.055em}}{\textbf{NTR}} & \multicolumn{1}{p{4.055em}}{\textbf{43.32}} & \multicolumn{1}{p{4.055em}}{\textbf{41.16}} & & \multicolumn{1}{p{4.055em}}{\textbf{41.01}} & \multicolumn{1}{p{4.055em}}{\textbf{43.75}} & \multicolumn{1}{p{4.055em}}{\textbf{42.4}} & \multicolumn{1}{p{4.055em}}{\textbf{41.92}} \
\multicolumn{1}{p{4.055em}}{\textbf{Beta-error rate}} & \multicolumn{1}{l}{\multirow{\textbf{17.92}}} & \multicolumn{1}{l}{\multirow{\textbf{21.44}}} & & \multicolumn{1}{l}{\multirow{\textbf{20.45}}} & \multicolumn{1}{l}{\multirow{\textbf{18.56}}} & \multicolumn{1}{l}{\multirow{\textbf{19.25}}} & \multicolumn{1}{l}{\multirow{\textbf{19.89}}} \
& & & & & & & \
\multicolumn{1}{p{4.055em}}{\textbf{∆}} & \multicolumn{1}{p{4.055em}}{\textbf{↑+10%}} & \multicolumn{1}{p{4.055em}}{\textbf{↓ -10%}} & & \multicolumn{1}{p{4.055em}}{\textbf{↑ +10%}} & \multicolumn{1}{p{4.055em}}{\textbf{↓ -10%}} & \multicolumn{1}{p{4.055em}}{\textbf{↑+10%}} & \multicolumn{1}{p{4.055em}}{\textbf{↓ -10%}} \
\multicolumn{1}{p{4.055em}}{\textbf{NTR}} & \multicolumn{1}{p{4.055em}}{\textbf{44.99}} & \multicolumn{1}{p{4.055em}}{\textbf{39.81}} & & \multicolumn{1}{p{4.055em}}{\textbf{39.5}} & \multicolumn{1}{p{4.055em}}{\textbf{45.6}} & \multicolumn{1}{p{4.055em}}{\textbf{42.94}} & \multicolumn{1}{p{4.055em}}{\textbf{42.04}} \
\multicolumn{1}{p{4.055em}}{\textbf{Beta-error rate}} & \multicolumn{1}{p{4.055em}}{\textbf{16.16}} & \multicolumn{1}{p{4.055em}}{\textbf{23.42}} & & \multicolumn{1}{c}{\textbf{21.03}} & \multicolumn{1}{c}{\textbf{17.8}} & \multicolumn{1}{p{4.055em}}{\textbf{19.35}} & \multicolumn{1}{p{4.055em}}{\textbf{20.54}} \
\midrule
& & & & & & & \
\end{tabular}%
\label{tab:addlabel}%
{\raggedright *{*All specifications listed here are for the month of interview and core family or referring to (HH). NTR refers to caseloads. Sensitivity checks are done for model (c). Denominator incl. Beta-error. \par}
\end{table}%
\end{document}
Thank you.

\documentclass{...}and end with\end{document}). – Vincent May 27 '22 at 15:03\multirowpackage is missing. Second, you use of the\multirowcommand is incorrect. The correct syntax is\multirow{<nrows>}{<width>}{<text>}with three mandatory arguments. In your code, the first two arguments are missing. Start by fixing these issues in order to get a compilable MWE. – leandriis May 27 '22 at 15:56$... $around your negative percentages to get the prober minus sign. – daleif May 27 '22 at 16:16\multicolumncommands. Try changingctop{4.055em}in the second argument of the\multicolumnfor the cells 21.03 and 17.8 (but really, a better approach would be to get rid of all of these useless\multicolumns). Also, if an answer solves your problem, you can accept it. It helps to keep the site organized. – Vincent Jun 01 '22 at 13:38