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!