I'm not sure if this is because a radio button cannot be un-selected after it has been selected, but I have some hidden fields that doesn't show until the radio button is checked "yes". For the radio button to even show first though a checkbox needs to be checked. Upon un-checking the checkbox the radio button field is gone, but the fields that are supposed to be hidden only if the radio button is selected "Yes" stays. Below are the screen shots and description of what's happening to clarify this.

First picture is once "Promotion" is checked the "Are they changing department" Radio button shows up.

Once "yes" is selected Old Department, and New Department shows up. Title (old) and Title (new) are already there since Promotion was selected.

If I find out I made a mistake and Un-check Promotion, the Old Department and New department still shows up.

These are my field rules for those section:

The top one shows the "are they changing department" if Promotion or Title is checked. Then the second one is to show old and new department, while hiding a different department list above if the radio button is checked "Yes".