On TeX.SX, if you look at your profile and click on the 'choose which badge to track' button, the badges spill over the bottom side of the pop up window:
This does not happen on Stack Overflow:
Therefore, I assume this is a bug.
I can reproduce this bug on:
- Mac OS X 10.11.3 & Firefox 44.0.2
- Mac OS X 10.11.3 & Google Chrome 48.0.2564.116
- Mac OS X 10.11.3 & Safari 9.0.3