Quiz

I don't think it has to do with Moodle version 3.8 settings.

Check the HTML code of the question. You should find this:

<p>
  Answer = {_0}°
</p>

If that still doesn't work, try this:

<div>
  Answer = 
  <div style="display:inline-block;">{_0}</div>
  °
</div>