in the insert behavior, you have set the data type for the radio button column to be:
this data type should be used for checkboxes only, not for radio buttons.
With a checkbox it can have a value or be blank, so a checkbox would send either the checked value or "" meaning no value. the Checkbox 1/0 data type converts the blank value to 0. and converts the checked value to 1. doesn't matter what the checked value is it could be yes, and it will get converted to 1.
with your radio button, you are sending either 0 or, no blank value. when 0 is selected it gets converted to 1, because it is not blank.
you should use the integer data type instead.