Header Margins Shrunk When Importing Style in Parent DIrectory

Question

I have a project directory of the nature:

• notes.sty
• class1/Index.tex
• class2/Index.tex
• classN/Index.tex

and I'm trying to usepackage the notes style for the TeX files to keep them consistent. However; whenever I import from parent directory using:

\usepackage{../notes}

Which has relevant stylings as follows:

\setlength{\headheight}{15pt}
\pagestyle{fancy}
\fancyhf{}

When I do this my fancy header's horizontal line acts funny:

However, when I move the notes.sty into each directory and import them using:

\usepackage{notes}

It's correctly sized:

Does anyone have any ideas how I can keep notes.sty in the parent directory (so there's only one copy), while maintaining the correctly sized header size? I can provide more mark-up, but I didn't want to overwhelm with text.

Answer 1

Found the answer here:

fancyhdr not centering after changed geometry

Essentially, whenever you modify the geometry of the page you need to redefine the fancyhdr width.