I am wondering how you know if your hot tub cover is the right size? We had someone from a spa store measure and order a hot tub cover for us. We have had the cover about two weeks, and noticed today that it overhangs slightly. If we move one edge flush to its side, the other edge hangs over about an inch and half inches. The steam seems to be staying in, but we are concerned it is slightly too big. The cover seems sealed over the whole tub, but not snug.