I don't know the "cause/effect" but several months ago, I noticed that Ways were being "duplicated" multiple times when I used JOSM and they weren't buildings! I could not determine whether it was at fault or when it was only for specific types of ways but I did "report" a potential problem to JOSM support because I had never encountered such a result using JOSM previously. You can probably guess what happened to my "trouble report" so I won't go there. By the way, it was extremely difficult to detect & delete these "extra" Ways manually using JOSM. I did the best job I could but do not know how successful I was in finding & getting rid of these "extra" Ways that got created.
Thank you, Harrison S
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