The FeedWordPress Duplicate Post Filter add-on might take care of this faster than trying to hunt down the root cause. It’ll probably turn out to be a problem in the feed itself, which you wouldn’t likely have any control over.
Despite the formats being fairly simple and well-documented, many sites/applications just can’t seem to produce a proper feed, for some reason. There are so many things done wrong in so many ways it’s generally less work to just deal with it than try and actually hunt down the source of a single case.
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