Bank Teller Intentionally Processing Checks For An Extra $50??

I have two domestic workers that come to my house twice a month. I pay them with one combined check. The last two checks that I have issued to them cleared the bank for $50 more than the amount of the check. The first time I thought it was just a fluke. I called the bank and they said the hand written amount on the check was very clear and refunded my $50. But now that it’s happened twice in a row, I suspect foul play. I suspect that the bank teller is helping them by processing the deposits for an extra $50. Is this even possible? I’m not sure what to do. Should I alert the bank? What would happen to the people involved if I alert the bank?
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