Is your cover hanging over the edge of the pool so wind can get under??
My pool is situated in the middle of a 5 acre field, we get super stong winds frequently, it hasn't so much as lifted.
When I cut it to size, I made sure that is sat flat on the water, then trimmed it so there is approximately 1" of gap between it and the wall of the pool, I cut two slits for the step posts that are 2' in the pool and a couple of 2" circles where the poles will protrude through, so the whole thing sits flat on the water.
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