KRR Unfair prices at Katips branch

So I've eaten at Kenny Roger's Roasters quite a bit these past few days. I ate at the Katipunan branch for lunch today.. and I noticed that their prices at this branch is PHP 5 higher than the other branches. The cashier admitted to me that he, also, was surprised that the Katips branch's prices are higher than the ones at the mall. Unfair!!! and what gives Kenny Roger's Roasters???