For some reason, the site keeps glitching and looking like this
whenever I return to the site after leaving. Deleting the cookies and site data fixes it but it just does it again when I leave the site and come back. I've resorted to blacklisting Evageeks from saving cookies and site date in the browser but has anyone else had this problem and who do I let this problem be know to to see if it can be fixed?

It never occurred to me; I also can't understand and reproduce the cause ― it might be something specific to Firefox.
On the other hand, the version of phpBB used in this forum is very old, and updating it involves a number of things.

I saw the same thing once a few weeks ago, and I use Chrome. It hasn't happened since.

That glitched state looks like a corrupted or incomplete load of the site styling, possibly happening when the site is under heavy load; if the broken state remains in the browser cache, then it will stick until cache expiry or flushing.

Damn you Anno, you renewed too much interest in Eva!!!