Hi,
From what I can see, there is a javascript error on your website pages:
monosnap.com/file/6zx3lSfahKylbIU0WQ6INX9zEpQedl
It apparently comes from the fsf component's accordion system.
Because of that, it prevents the javascript of the custom fields to initialize properly when the page is loaded. That's why it doesn't work when the page loads, but then it works fine if you change the radios yourself once the page is loaded.
So I guess you'll have to check with the developer of that fsf extension.