There appears to be a Bootstrap CSS Conflict in Joomla Gantry 5.
A Joomla custom field of the "Radio" type is supposed to render a horizontal button bar similar to the one you see in the site backend when editing an article that uses this type of custom field.
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Instead, nothing at all is rendered in the site front end. The custom CSS code specified at the following Github post makes a typical-looking vertical radio button list appear, but that is not what it should look like.
- On a Joomla 3.9.x site running Gantry 5 with the Hydrogen or Helium template, create a custom field of type Radio. Give it 3 or 4 options.
Be sure to publish the field.
Create an article that uses this field.
Edit the article in the frontend of the site. The button bar will not be visible.
Set the template to one of those that comes with Joomla and edit the article in the front end again to see what it should look like.