Did you "clear" existing cookies or just turn them off (block new ones). In most Android flavors with its native factory browser one can do both under Settings-->Privacy and Security-->Cookies. Other browsers work similarly.
Try this: Log out of Forum, restart device, open browser to any other webpage than this Forum's, do both cookie purgings in browser's Settings, restart device again, open browser and check out Forum formatting without logging in, if all seems well, log in. If all still seems well, reactivate cookies. Restart device and test again. Rinse, lather and repeat until and up to the point the Forum's tolerable (with cookies or without). It could be the server's just feeding or has fed you a rotten cookie or multiple conflicting ones.
Also, how old is your device? You may want to try the above regimen up to and including clearing and disabling cookies and restarting, and then grab a fresh version of Chrome off of Google Play. If prompted during installation, do not import settings, etc. It should create a new
"Chrome" icon instead of the old familiar factory one labeled "Internet". Try using that fresh install.