Additional Checkboxes don't accept styling

Problem/Motivation

When you additional checkboxes, you can't add styling to your text. For example, the default checkbox is

Accept Terms & Conditions of Use

But If I attempt to put strong tags around a word, the html just appears within the label unlike the default checkbox. Here is my additional checkboxes

But when it renders, this is the output

How can I bold the lettering in additional checkboxes? This method worked in D7