If you see a transaction that you do not recognize, please log in to your GunBroker Pay account and review your transaction details. If you see something like this:
GunBroker Order Fees: Automatic payment of 123.45 USD based on payment agreement...
That is for your GunBroker.com fees that you have agreed to pay automatically from your GunBroker Pay wallet based on your payment agreement with GunBroker.
Please note that you as the account owner are responsible to have sufficient funds in your bank accounts that you have connected to your GunBroker Pay account.
RELATED QUESTIONS:
When I pay my gun broker monthly tax and the money fees, why are you not using the money in my gun broker pay account?
ANSWER: When you set up a payment agreement on GunBroker.com, you had the option to either use the funds they have in their GunBroker Pay wallet, or to use their bank account. It seems that you chose to use your bank account.
This is done in your GunBroker.com account on the Add GunBroker Pay Account -> Allow recurring withdrawal screen.