We’ll need some help from the https://usegalaxy.eu server administrators to figure out what is going wrong. They are in Germany, so, the end of the day there right now. Give them a day or so to reply.
Misunderstood based on the assigned server tag – this is the server you are actually working at:
Contact information is usually at one of those two places for public Galaxy servers, but this one doesn’t have a clear one. So, instead go the server’s home page itself and contact the lab that runs the project, they can help route you to their administrator to get the issue reported/fixed.
Thanks for reporting the problem!