When you place any of the  table features , you can invite your neighbors, and a line forms, and the line can get filled in with non-player characters. That part is on purpose. But, for an unknown reason, an extra one can be added by mistake and assigned the name  ‘Bob Fisher’ He is not an evidence of any kind of hacking or a compromised account. He is harmless.  But we’ll keep working to make sure he gets un-invited from your  Table features  soon!