Even math has to be woke now. 88 = "HH" = verboten!
Edit: Sorry if the answer wasn't helpful, couldn't resist
It seems most likely that caching can cause a mismatch between what the client displays and what the server expects. Reloading the page with cache ignored (shift+F5 or shift+ctrl+R or click the reload icon while shift pressed) should do the trick.
I sometimes can't log into the website and when that happens I figured a workaround. Click on the Entropia Universe logo on top of the website then select My Account on the left. Finally enter normally with your username and password etc.
Did you gain perception just before that? Then you need to face north and scratch your left earlobe before you click. And after saying Hail Lootious three times a monkey appears to solve your math problems and give you a backrub .