Mines a bit confusing. As soon as I send out a group invite I get a message saying that that person left my group (when they were never in the group in the first place). And from their perspective they r in the group. So then I try adding them again and the invite goes thru. But then when the other person tries to leave the group they cannot. Nothing happens when they try to leave (either by right clicking their name or by hitting x and then attempting to accept the leave request by hitting e.

I have been on both sides of this paradigm on multiple occasions.