Sims don't auto-group/can't do group interactions

Unable to take my families out and have them eat or bowl together anymore. I was able to conduct both of these activities a month ago, but for some reason, the game will not allow my families to interact as a group anymore. For example, when I take my families out to eat, they will no longer sit at the same table. Instead, they sit at different tables, which defeats the purpose of my taking them out to dinner.