We've had similar reports about ads playing on channels that are not part of YPP from other users too and are currently looking into it. That said, please help us with a screenshot of your channel's monetization page: https://yt.be/help/acmo . We'll take a look.
Thanks for the screenshot. As you've already re-applied for YPP, we suggest you wait for the decision. You'll receive an update as soon as our team comes to a conclusion about your application. Appreciate your patience in the meantime.