Good Evening @Seller_Iz4l3pjXW2mej - It looks like one of our seasoned seller's @Seller_OvL8C4BJWiuS9 was able to provide some guidance regarding the possible duplicate fees on your account.

If their reply helped you, feel free to mark it as “Most Helpful reply” using the 3 dots in the corner of their post. It's a best practice just in case another seller comes along and asks a similar question, it will be easy for them to find the answer.

If you end up needing downgrade to an individual account for any reason, here is a help page regarding downgrading your account. I wanted to point out the line that mentions:

You can choose to downgrade your account from a Professional selling plan to an Individual selling plan if you don't want to be charged a monthly subscription fee. To downgrade your account to an Individual selling plan, click Downgrade in My services. For more information, see Selling plans.

Please let us know on this discussion if you require additional assistance or you can always contact Selling Partner Support with inquiries at anytime. Thank you for checking in with us on the Seller Forums and for choosing to sell on Amazon. Have a great rest of the week! ~ Cooper_Amazon