Radio Button Not Mapping Correctly With Fees

I set up a fee field with a radio list, and mapped everything per instructions, and the fee was not associated. I switched the field type to checkbox and it worked just fine. Its not a major issue, would rather be able to limit user selections with radio rather than checkboxes. Is this a bug or did i set something up wrong?

I

I believe it is just something wrong with your settings. The fee calculation doesn't depend on Field Type, so in this case, please submit a support ticket sending us administrator account of your site, let us know the name of the custom field. We will check and solve it for you.

Tuan