Been to a few places like that.

A Chinese dim sum restaurant near me appears to have an A, B, C and possibly D team depending on day of week. Some days, frozen stuff is just as good if not better. Only been excellent once. It's not uncommon for Chinese restaurants as few of them have chef owners, or at least where the chef, if a hired gun, has any real stake.

A local Thai restaurant (switched from a gourmet restaurant in light of the then-upcoming recession) with the owner-chef trained at the Blue Elephant in London had, on different days, completely different styles of pad thai.