Okay, so someone has gotten creative behind the panel. I would tend to disregard the breaker labeling in this case. The wire is going somewhere. You only have two and a half options for the popping breaker. There is either an excessive load to whatever it's hooked to now or there is an intermittent short. The half option is a bad breaker that trips all by itself. That is a much less common situation. You should also be on the lookout for something that was disconnected and the wire left dangling.
Dave
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