Separate Line Math Not Working

Summary

Separate line math is not showing up properly on my Gitlab instance or gitlab.com. It shows as a code block instead of as formatted math.

Steps to reproduce

It should be visible here that the separate line math is not showing up (Copied from https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/user/markdown.md#math)

This math is inline a^2+b^2=c^2.

This is on a separate line

a^2+b^2=c^2

Screenshots

the following shows up in Firefox:

And in Google Chrome:

What is the expected correct behavior?

Both math blocks (the inline one and the separate line one) should look identical.