billing

One way this might have happened is you got to the renewal date, and mistakenly went to pay for a new plan. Now you would have two plans: the new one, and the old one, automatically renewed. You will pay for both until you cancel, if this happens. HOWEVER, this would show in the billing history.

If you are paying for one plan, and one plan shows in your account, then someone with access to your card number has bought a plan too. This is a bad thing, and unless it is a family member you can deal with, you should contact your card issuer.

Please contact support to clarify why the charge was made to your account, these are peer to peer forums and you won't get much help for this issue here. To contact support. Login to your account and navigate to the URL below. Make sure that the browser has cookies enabled, and all script blockers are disabled.
https://helpx.adobe.com/contact.html
Click on the chat icon on the bottom right, and type AGENT to avoid bots and talk to a human.
Also, be mindful of answering anyone who sends you a private message. See the following for more information about scammers
https://tinyurl.com/y7cfrr7y
-Manan