Yeah, that happens to me every spring, James. Even with a good cover, wind can easily sneak light stuff like petals or small leaves underneath the edges or through the gaps near the skimmer area. They somehow always find a way in.
If it’s really bugging you, you could try using some water tubes or extra weights around the edges to keep the cover sealed tighter. I also started running my skimmer basket sock during that season, it catches all the little debris before it sinks or clogs anything. Short of trimming the nearby trees, it’s kind of a losing battle, but tightening the cover and skimmer maintenance definitely helps keep things cleaner.