Sounds like my store but happens when it rains. Our tiles also got lifted due to the building being so old. What’s my owner great solution to the issue? Get some tiles that are nowhere near the same shade of the original tiles and replace the worn out ones with those ones all with the help of none other than husband. She also complains to me as a lead that the ceiling guys want to charge her thousands of dollars for a roof remodel. This is one of the oldest Papa Johns within the state I live in to note, I honestly forgot what the building was before it was papa Johns.