As the title says, when you’re at a group-owned place and are awarded a badge, the name of user with the UserID matching the Group’s ID is the name that appears rather than the group’s name.
An example would be at the group game Farmulator owned by the Farmulator group. If you earn a badge at their place, the popup on the side of the screen says that it’s Tete789456123’s badge.
A while ago I posted the same bug occuring on this dialog
which was then fixed within a day. I think they somehow missed the purchase completed dialog as well.