I think that the ask box widget on your q2a website ( http://html5panda.com/ ? ) is visible only to registered user, so I haven't been able to have a quick look.
However I could have a look at the "normal" ask box page, and I can see there another (related ?) issue.
The categories dropdown list is displayed twice.
Having a look at your page, I see that 2 different jquery libs are loaded : 1.7.2 (correct) and 1.4.3 (wrong).
This is causing some errors since the 1.4.3 code is executed (instead of the 1.7.2) :
I would correct this issue first.....
Probably the 1.4.3 js is a dependency of the bbcode-editor plugin.
The plugin should be "refreshed" to use a more recent markItUp version.