MyBB Community Forums

I'm not sure if this is a bug or a limitation.

If your primary group and your display group are set to not to be shown on the forum team page but one of your secondary groups is, you're not shown on showteam.php. It only recognizes the primary and display group of the user.

If it's not a limitation, I can confirm it.

This is neither a bug nor a limitation. This is default functionality. A secondary usergroup is for putting someone in a group that shouldn't be immediately displayed to the public.