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the clock is it hard wired into a system or is it one you can remove from the wall and it runs or batteries or something? If it is hardwired to a system the clock may have been updating, I have seen the same thing happen before.
One of the investigators was tall enough to get to the clock and check...it's got two wires plugged in through a hole that was drilled into the wall, one for power and the other connected to a sync server so a bit of a disappointment but at least the team always look for normal explanations before they jump to paranormal ones.