Why do the Provider Room Bookings say 2.5?

If the Provider Rooms booked don't equal a whole number, its likely that you have a single client booked into a room which is set to having a 2 PAX option.

Go to the Booking Selections tab, select that single client, and change the PAX per room to 1 (not 2). You should change the rate per room at the same time (not shown in the clip below).