I have had that happen every once in a while in the past. They're only human, after all. It was very easy to fix at the next weigh-in, and they've always been happy to resolve it.
The most recent center I was (a couple years ago) at actually had computers! (Crazy, right?) They scanned our cards, and it automatically did the math, then printed out a sticker that we simply put into the weight tracker. Very efficient, and I never saw a mistake with it.
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