Spun dampener

I have had 1 440 engine out of 20 or so in the last 35 years that the timing mark on the dampner didn't line up when degreeing in a cam.
I just guessed it had spun on the hub and replaced it. To look at it I could not see any problems with the rubber ring.
After reading this it is possible I had the wrong timing cover or water pump housing on the engine if that makes a difference.