Doesn't plycount just pull the data from the US Chess site? I think that is how it works and it may be a one-time process as new events get rated.
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If that is the case, the original event likely had an error and plycount just replicated it. If it is correct on the US Chess site then you should contact the other site and ask them to fix or resynch.
This is the second time a TD has wrote the wrong results on plycount. Is it possible for them to fix the errors and get a new updated rating from a tourney that's already ended and recorded on plycount and USCF??