If you work the metal inner flap by hand, I think you will find that it hangs up in a partially open position. Fix is to trim it some or eliminate where it hangs up. Wind can open it for rain to enter in some cases, especially if it hangs up, and the wind will free it so you won't know it is doing it. All I got for you. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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