Tried looking for a similar issue, but can't find one. Apologies in advance if this is a duplicate.
The CSS i have in "Theme Options" isn't loading when Cornerstone is used. It was hard for my client to use Cornerstone because some sections looked like they were missing, and the layout just looked messed up in general.
Versions i'm using:
XTheme = 6.1.6
Child Theme = 1.0.0
Cornerstone = 3.1.6
This is what the site looks like when "Theme Options" is open.
This is what the same section of the site looks like, when "Cornerstone" is open.