Thank you for bringing that to my attention!
I was wondering if that was deliberate
As far as I understand, the building of the instance list is automatic. It was possible to find instances from mander.xyz a few days ago, so what I think happened is that something about the instance caused it not to be recognized as an instance the last time that the database was filled. It may have been a one-time issue that will be corrected next time that the instance list is populated, or there could be some more problematic bug. I will reach out to the developer to see if they can help me sort this out, thanks!