threaded crank, should i put good wahoo pedals in them?

i have an old indoor Keiser m3 and i want to put my wahoo power pedals in them to track my power.

i took the old pedal off the Keiser m3 and noticed they dont smoothly go in and out after taking the initial tightness off. I put the wahoo one in and again needed to use alan key to put it in the whole time. ( I couldnt use my hand). I then pedaled and the wahoo worked fine. BUT. I took them out again because Ive realised since they don't go in and out smoothly maybe the crank on the keiser is cross threaded and putting the wahoo pedals in might damage the wahoo pedals.

Let me know what I should do. again the wahoos did go in and worked fine, but just wondering if there's any damage potential to the wahoo if putting into a worn out crank.

THNAKS