Double payment w/ FluentBooking

When it comes to FluentBooking, how can we prevent a user from selecting the same booking product and double paying when using woocommerce?

I already have the woo product set to "Limit purchases to 1 item per order" but it still allowed the person to have two of the same appointment products in their cart and they booked and paid twice for the same appointment date.

The booking only appears as 1 on my calendar.