The only time I've actually seen that happen is when someone damaged/cut the neutral somewhere in the wall and decided to use the ground for the neutral. You're going to have to trace the whole circuit out and check for neutral continuity between all the junction boxes on that circuit and into the main panel. When you find the section with the broken neutral, you'll have to replace it. Be sure to check all the connections at each box and remove all backstabs you might find.
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