All resolutions above 1080p are affected by this bug. As I'd like to keep this tracked all in one place, I'd like to refer you to this topic http://aslain.com/index.php?/topic/3346-mod-installer-not-displaying-correctly/
I'm hoping to get this fixed as soon as possible but I can't give you a window just yet.
I can tell you that I've figured out that is has something to do with how the installer scales according to resolution.
For more info check the link above and I'll keep you posted on progress there.