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I modified the template of my university because I don't like it and the cover is the only thing I really have to use, that's why I had these combinations of geometry settings. Inserting pdf's of the cover made it work. Thanks again!

I would like to make my margins (for the non-cover pages) a bit narrower at the base of the pages because there's a huge white space between my page number and the edge of the page, but when I change the geometry settings, nothing happens. What's wrong?

Problem #2 is that the margins of the back ...

Yes thanks, that works!
Everything in the real document is actually in Dutch, but I changed the MWE a bit to make it more understandable on the internet.

The titles of my chapters after the introduction disappeared and there's only 'chapter X' left. I'm using TeXshop with Biber and BibLaTeX.

Minimal working exemple:

Main document

\RequirePackage{fix-cm}
\documentclass[12pt,a4paper,oneside]{book}

\usepackage{graphicx,xcolor,textpos ...