problem with shopping cart

After adding the product to the cart and then clicking proceed to checkout, an extra $10 per product is being added. If I click a payment method, the pop-up window shows the correct amount that will be charged. If I deactivate multi currency pro the problem is fixed.

I also have show currency in cart and checkout checked and it does not show up in either.

I look forward to hearing from you with a resolution, thank you.