Just noticed this earlier on my Mac, but the checkmark when you click a badge description (i.e. [badge:socratic]) clips a bit.
Here's an image for a better description.
OS X El Capitan, 10.11.4
Safari Version 9.1 (11601.5.17.1)
Also confirmed on my Windows box:
Windows 10 Enterprise
Google Chrome Version 49.0.2623.87 m