Default Selection in Radio Group on Reload

When I make a selection in a dropdown it reloads a set of radio groups and each of these radio groups has a default selection set to "None". This works as I intended it to. The problem is that if a user makes a selection in one of the loaded radio groups and then makes a new selection in the dropdown it reloads the radio groups and does not reset the default selection to "None". It leaves all the selections blank. Is there a way to get it to return to the default whenever it reloads?
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Front End - Form

Selected value should be the VALUE, not the LABEL. Try putting 0 in there.

Same result...

Weird, now when I set the selected value to 0 it's not working at all even on loading of the page. When I change it to None it works on the page load but not on a reload of the radios
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Anyone know if this is a bug or if I have to force a reload of the entire page somehow?
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Here is a front end link - http://coupons.cuttingcoupons.net/index.php?option=com_chronoforms6&chronoform=calculator--04

Works for me on load but not on field reload. I think not doing default selection on reload is a bug but you should definitely be using the value and not the label in the default selection field