Hi community,
I'm urgently looking for a solution to see my custom field list in the admin view:

Normally there should be about 34 custom fields listed. But since a few days (can't say how long) the list is empty and there is no search input bar either.
I looked around to see if anyone else knows of this problem and I have found some solutions about script code like javascript in custom field description. We do not have any descriptions with code inside. I checked everything.
Is there any other possible explanation and solution for that?
We use Jira Server with core version 7.13.1
Thanks in advance!