HenrikHL
This is more an issue with SwaggerUI than SwaggerHub itself - I would encourage you to raise this question with our support people for research: https://support.smartbear.com/swaggerhub/message/
We do indeed import the newest version of the open source swagger ui every couple months, and the last time was at the end of October ( you can see this on the What's new page), hence why you are seeing this change. I looked through the (closed) issues on the GitHUb but I can't see which one would cause this. You can raise your issue there to get it directly to the open source team: https://github.com/swagger-api/swagger-ui