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Another possible issue here is the head work that was previously performed. It's possible that when the head was milled flat it may not have been perfectly square to the cam.
A little extra info for those playing at home...... Kevin's last belt did this as well.
Interesting, I also wonder if a worn front cam bearing might be a issue with this also. I could see the possibility of one using a silicone adhesive to "help" seal the front end of cam housing, getting sloppy with it, and cutting off oil supply hole to this bearing causing premature wear on bearing, and changing the square lay of sprocket to belt. Possible?