This happened to me as well. I called the place and they explained to me that when they charge the card it opens up a charge of the amount plus a percentage for tip. This way they are assured the charge will clear. He told me to check my records a day or two after and you will see the correct amount. When I did the amount charged that I signed for was there. Just like when you use your debt card for gas they open up a debt of $50 at most places.
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