File with broken grouping

I’ve got a strange one here, a particular file where grouping doesn’t work, selecting something in a group never selects the whole group. I’ll send the file to support tomorrow, unless this is something that has been identified already?

Hi Jim, I’ll take a look when you send the file - I don’t know of this specifically, but grouping can appear to be strange in some cases where objects are members of more than one group.