First, view the resource by switching to week view and checking off just the location in question. See if the event still exists.
If it does, I think you should be able to pull it up and see what calendar it's on. It's quite easy (too easy) to move an event to a different calender. I haven't tried it, but I suspect it may happen when a calender editor who doesn't have rights to the calendar the event is one pulls up the details and "saves" it. There was a bug along that line, but I think it's been fixed. But it still might be too easy to do.
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