[2021] Is it just me Or a Bug

Could ypu clear your cache, disable any plugins and see if that fixes the issue?
And if not, try Firefox and see if the issue persists?  

Can you open the console of your browser before opening your Castle and make a screenshot of the console for our developers to investigate the issue better?  

Do you still have this problem?  

Outlaw Dread said: Same problem, all browsers, cache cleared, page reloaded, PC rebooted, still there.
(edit) OK, hope this screen shot is readable
View attachment 7548

The error is from the FoE Helper.
The issue with the Castle System is known and actively worked on.