Sadly everything looks fine for me. i.imgur.com/vJkfSUZ.png I opened it in GTK 3.8, 3.10 and 3.12. Make sure you're using the latest version of this theme. What version of GTK and what OS do you use?
Hmmm.... that's weird. I was running the latest version of this theme and tried to download it again too but with no help. I am using Crunchbang 11 Waldorf which is based on Debian 7.6 Wheezy and the Gtk version is 3.4.2-7
Unfortunately this theme only supports gtk versions 3.6 and above (just like the original Numix theme). I don't know what I should do to make it work for you 