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I'm writing a report in LaTeX using the Overleaf online editor. For some reason - when translating to pdf - it arranges all contents far-left and doesn't fill out to the right. Does someone know how to fix this?

Below is an example of what it looks like. First page of my ToC is aligned as should be, but the second page f*cks up and then the rest of the pages in my pdf stay left-aligned as well.

I've styled my Overleaf project with several .tex files. My main.tex looks like this:

documentclass[11pt]article
usepackageoutline
usepackagepmgraph
usepackage[utf8]inputenc
usepackage[normalem]ulem
usepackageappendix
usepackagehyperref
usepackagexcolor
usepackagegraphicx
usepackagefloat
usepackageenumitem
usepackagegraphicx
usepackagesubfig
usepackagesetspace
usepackagepdfpages

begindocument

titletextbfxxx
authorxxx
maketitle
newpage

setlengthparskip0.4em
renewcommandcontentsnameIndholdsfortegnelse
tableofcontents

%--------------------Make usable space all of page
setlengthoddsidemargin0in
setlengthevensidemargin0in
setlengthtopmargin0in
setlengthheadsep-.25in
setlengthtextwidth6.5in
setlengthtextheight8.5in
%--------------------Indention
setlengthparindent0cm
setlengthparskip1em

%.TEX LOADING HERE

enddocument

Please, if anyone has any suggestions as to how I can fix this, it will be greatly appreciated!

You have not posted a testable fragment but the cause is clearly

setlengthoddsidemargin0in
setlengthevensidemargin0in
setlengthtopmargin0in
setlengthheadsep-.25in
setlengthtextwidth6.5in
setlengthtextheight8.5in

You can not change these settings mid page. Changing them after begindocument is not really supported, latex has to set up various page parameters and it does this at begindocument.

Move that block to the preamble (or better use the geometry package rather than low level assignments to set the page size.

If you really want to change the page size mid-document, you need to reset the internal parameters to match, and do it after a clearpage forced page break, or more simply use the geometry package interface to changing the page size for specific pages.