It might be a debit card transaction from a few weeks ago that hadn't been charged to your account yet. Or someone else could have used your card. Call your bank or stop in and ask about it if you're not sure
It happened to me also. It showed up on my checking account transaction today as "Check Card Cash Adv- PNC/ATA" for $303.16. It's scary to see someone had access to my account so I called PNC and put a stop and cancelled my card.
I know that for me, I used the "CASH" app to give my spouse money via forwarding it to her within the app so now my account says the "CHECK CARD CASH ADV.-PNC/ATA