radio buttons not marking current selection as ‘checked’

I’m using Gravity Forms: Post Updates to allow users to update a custom post type on a site. For some custom taxonomies I’m using checkboxes and they populate fine and show which terms have already been selected when a user is using the form to update that entry. However, the taxonomy fields where I’m using radio buttons don’t show the currently selected term as ‘checked’. In the dashboard, however, I can see that when I do select a radio button it is recording that term as selected for that custom post entry, but this is going to be confusing for users on the front end if when they go to update an entry it looks like no data had been selected in those fields. Any advice on why the radio buttons are not getting marked as ‘checked’?