Creepy management rules
People can opt for the Lunch or Dinner (more complete and expensive) menu. The problem is, if anyone at the table opts for the Dinner menu, then everybody else needs to pay for the Dinner menu as well. If you don't accept that (paying extra for something that you don't need), the management gives you the option to move to another table. So, the friends that pay for Dinner menu stay at one table, while the others stay at the Lunch menu table.
In other words, the management is afraid of customers stealing food from friends and because of that is enforcing crazy rules on its customers.