'65 Barracuda Wipers

Several years ago Dave Bass rebuilt my wiper motor. I reinstalled it right away but the wipers wouldn't park. I returned the wiper motor and the switch to Dave to recheck it. He reassured me that there were no problems and sent it back. I reinstalled it and it still didn't park so forgot about it. Today I got a bug in my *** and decided to fix the problem and got it to work properly. Well, the wipers now park but in the upright position instead of the normal position. What the 'H' is going on?