It's probably due to the heat. When you're over 33-35 C they tend to drop flowers. The plants will stay alive until it cools off then set flowers/fruit, though.

We had an unusually hot summer where I am with many days in the mid-90's and my pepper blossoms kept falling off. When the weather cooled into the mid-80's, I started getting peppers. Hopefully, you will get some peppers when your weather is cooler.

One trick I learned from this forum is to drape a shade cloth over the hoops when it's over 32C (make sure there is enough head room for ventilation). It works great.