Hi Kiminnc, there are 2 ways that your checkout includes a shipping fee:
1) it is set up in your PayPal profile, in this case log-in into your PayPal account and click on the link below to check if you set any automatic shipping fee for your checkout: https://www.paypal.com/cgi-bin/customerprofileweb?cmd=_profile-shipping
Consider also that the automatic shipping fee is only applied for the standard PayPal buttons (not for ExpressCheckout). Check this link for references: https://developer.paypal.com/docs/classic/admin/checkout-settings/#id08A9EK090C4
2) You are passing a shipping variable into your button/integration. To check it also depend if you are using a standard button or ExpressCheckout. If you are using standard buttons then the variable to check into your button code is: shipping. While if you are using ExpressCheckout check for the variable PAYMENTREQUEST_n_SHIPPINGAMT (Ref.: https://developer.paypal.com/docs/classic/api/merchant/SetExpressCheckout_API_Operation_NVP/ )
If you see any value passed to this variable in your code then cancel it as it means you are passing a shipping fee to apply.
