@Rich2944 I see a few factors contributing to your problem. You have 4 queen beds, and 4 baths. People see you can actually sleep 8 comfortably, and a few more would be easy to squeeze in. You have seating for 10 between the dining table and island. You mention ‘entertaining’ in your description. This further paints a picture for guests of their large group enjoying your space. Your limit is 4, but you accept bookings for 6. Therefore, people see they can easily push your limits. What’s the harm then in bringing 8? 10?
Your rules state extra fee for extra guests. This is mixed messaging. It will say to some people that it’s ok to go over 4. You need to pare down your house rules (seriously, no one will read them as they are far too long - save the rental contract language for a separate document) and make it explicitly clear that 4 and ONLY 4 is the maximum occupancy, all guests must be named on the booking, and defying the occupancy limit is cause for termination of booking. Vet your potential guests carefully with thorough questioning of their plans, and be mindful of red flags.
You should really remove the address of the listing from the house rules. It’s a security risk. Again, save that info for your rental contract for confirmed bookings only.