Ah, it's always the simplest of solutions that works...
Thank you very much!! It ended up being an add-on that removed tracking parameters in URLs. I just ended up deleting it since I never really saw it working haha.

Hey y'all, I've been having issues for a WHILE with the text preview function. When I type something and submit it, the only thing that comes up is a completely blank white page. Inspecting the page doesn't reveal much either. I'm using Firefox if that affects anything. Also putting nothing doesn't work either. Any assistance?