First post, I found this site when I was researching my safety cover purchase. Being new to the safety covers I’m not sure if what I have going on is normal or not. My water level is to the low side of what the manufacturer of my cover says it should be (12” to 18” below deck). This is a Merlin Smart Mesh. Whenever it rains I get a puddle in the middle that takes days to drain. Does this look right? It sure seems to have a lot more sag than I expected.