Are you sure that you have Apache in the webserver? Maybe you're using ngnix or other.

What's your site URL's?

Actually now that you mention it, if I type in an incorrect url I get a 500 :/

That's cause you have a bad code for the 404 handle request, check it at the htaccess.

Meta the 404.shtml to redirect to your 404 script.

When I go into my cPanel and select error pages and then 404 it brings up the code in my txt that I attached.

I have absolutely no idea what you mean :D

Ehh https://vborg.vbsupport.ru/showthread.php?t=234274

See contents of 404.sthml

The problem I think is being caused by the modrewrite in the htaccess.

Yes in your .htaccess ErrorDocument 404 /path/to/your/file

Something like that?