We had an oval Impact pool installed last year and we built a deck around one end and one side. We had 1/2 inch spacing between the top ledge of the pool and the decking boards, the deck did not touch the pool at any point. The pool was opened this spring, and the gap increased to over 1 inch on the end, and is now touching the entire side of the pool. The installer said that the pool probably settled, and that due to rough winter, may have pulled in a little bit. He said to not worry about it, and that I could cut the boards back on the deck. Question: does this happen normally, is there a possibility that it may collapse?