I recently had my vinyl liner replaced on my inground swimming pool. I have bull nose coping, (this was not changed), and I am noticing that it is separating from the concrete deck in quite a few places (about 3/4 inch). I also notice that where the pieces of coping connect to each other there are signs of separating as well.

I am wondering if anybody can help me to know what the problem is and how it could be fixed. The installer is supposed to come back to fix some pleats in the shallow end and I would like to talk to him about this at the same time. He actually told me that my concrete was moving away from the pool which I find rather ridiculous!