Note that you are not supposed to change direction on the Kansas Turnpike at the Service Area. If you enter the Service Area going West, you need to exit going West. If you want to turn around, you are supposed to take the next exit and then get back on the Turnpike.
Back when they had people collecting tolls, you could get your toll ticket stamped for changing directions at a Service Area. I don’t know if they can still do that with the automated systems they have in place now.
The FAQ on the Turnpike web site says you were charged a per-minute rate because you entered and left at the same place.