Been there, done that. Sure, someone COULD have done something to change the cam settings; changed the cam or who knows what. Some clever folks down in NEPA, or elsewhere. If you are loosing sleep over this, you need a day off.....not worth a 'dirt nap' over. You are on the right track, and before the day is done, you will have solved the mystery.
The more important question is: is the boiler running satisfactorily? I'm betting on 'yes'.