Tiny Tina, (DON'T) put me in the game!<Uninvited Players Joining Xbox>

While playing in my friend’s TVHM, we found that the game often put itself to ‘offline’ mode. That was fine and dandy because it is easy to change. HOWEVER, what was extremely annoying was when random people kept entering our game(s). We checked the session options, and it WAS on friend’s only. Perhaps this was the problem? We changed it to invite only, and the problem still occurred. Is anyone else having this issue?

TLDR: People are joining our session, even when it is on invite only.