“Right click” is only used to quickly show/hide the tab on the left, everything else (including context menus) is a simple click. Maybe that’s your issue? Try simply clicking on a room.
If not, then that’s definitely a bug - I test the game on a macbook and never had this issue
In this instance, I'm trying to select a Preferred Proposal with a standard click. Menu items with check boxes are not selectable for me this way. (or I'm doing something wrong)