The monetization icon is applied automatically (via machine learning technology), so mistakes do happen. You can request a review for someone to take a look & update the monetization status if needed! More info here: https://yt.be/help/NW2d . Hope this helps.
Thanks for the details. In this case, you'll just have to wait until your hear back about this. We don't have a specific timeline, so keep an eye on your inbox for the monetization status update. Hope this helps.