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Sounds like money laundering, some one gets your credit card info then uses it to make purchases with clean money then pays off your credit card with dirty money. Make sure it all balances out to 0 at the end of the day and you probably won't notice for a while.

Report it as fraud and get a new card.

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The hard part of money laundering is getting dirty cash into a bank account. Since you can't pay credit cards with cash the payments must come from a bank account direct debit or check. If you already have the dirty money in a bank account you don't need to further wash it by making purchases and then paying for them. If this was some kind of money laundering I would expect large amounts or thousands of transactions -- no one needs to launder $100 or less.

Reporting to the card issuer and getting a new card is good advice.

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