This happens more than you might imagine. As long as the legal description is correct you should be fine. Also, APN do change from time to time (not often) but it can happen. The old numbers sometimes get confused with the new ones.
That said, an easy fix is to do a correcting deed.
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If it was recent, you could take the original deed back to the recorders office. They might allow you to re-record it with the APN corrected.
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I agree with my colleagues; deed correction is not an overly complicated process.
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