In regular mud, type LE will take you out of a party if you are in one, and will take you out of your gang if you are not in a party.
Here it tries to take you out of your gang regardless.
Moreover, uninvite X (as party leader), should say X has been removed from your party, regardless of whether or not the game thinks they're in your party.
This is so that mega doesn't be stupid when someone walks out of your party and thinks they're still part of it.