Just broke down and called PP Help and discovered why this is occurring for me. When creating your button, you can't have a customized option, for instance a text field for names or even a drop-down menu with different prices. This sucks, but at least now I know why it's happening. The work-around is either to leave the price blank and adequately advertise on your site that the customer needs to do the math and enter the correct amount when checking out, or use a shopping cart.
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