Stripe.com payment integration module

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Something odd that's been happening..when I check on the orders at Stripe every transaction has an additional $5.00 USD charge added to it.
For example: I have a $10.00 test product in the Zen Cart store... when purchasing the product it shows the correct price of $10.00 to be charged in checkout however, when I check the completed transactions back at my Stripe account it is a $15.00 transaction... every test order has this $5.00 added to it. Has anyone else had this issue or know why this may be happening?
I don't knpw if the charge is occuring at Stripe or in Zen Cart.
I have disabled Flat Rate shippping module and there is no shipping/handling fee being applied in the product listing. I'm trying to track down why/how this charge is occuring but have not been able to figure it out yet. Any input or suggestion on where to look and/or what to do is greatly appreciated, thanks