Back up lights work but opposite to the way they are supposed to work.

What is your question?

1992 Honda Accord EX manual transmission. I have had intermittent "brake light warning" lit on my dashboard. Changing bulbs didn't help. I finally bought a replacement Tail/reverse light assy (PN 043-1171)which fixed the problem. However, I noticed the back-up lights were not present on either side. When I put in new bulbs, they light when the car in NOT in reverse and they go out when the car is IN reverse. Bulbs/fuses are good. What could the problem be?