Primus brake controller

Hello I just purchased a primus brake controller (had it installed) and on my trip this weekend as driving I noticed it in .C mode then I'd stop then it shows numbers that appear. When I start moving again, as I accelerate, it never returns back to .c. The numbers sometimes look like they are increasing with speed. Are my trailer brakes activated? Am I dragging? What should be displayed while driving (not braking) same would apply to a prodigy P2 or P3 (same company)