All Links Go To Root

It seems as if your server doesn’t recognize index.php as a home page. If you put index.php before the ?cat=1 then you see the correct category. Likewise, if you go to https://www.housetepes.net/uninspiring/ without the index.php, you should see the list of files in the /uninspiring/ directory.

Yeah I had originally created an index.html to put in the /uninspiring/ directory that would redirect to to index.php, but I removed it thinking it was causing the links not to work. I guess I need to somehow make my server put an index.php in front of everything?

No, you have to make your server (is it hosted by you?) to recognize index.php as a vlid index – as it was said above by dgstinner.