Missing GB After Installing Kali Linux NetHunter

I just installed Kali Linux NetHunter (Kitkat 2012) on my Nexus 7 (2012) 32GB. I originally had approx 24GB of unused space. Now my Nexus 7 says my total space is 6.02GB, with only 2.33gb available. I used NetHunter Installer v1.2.7 to do the install. Also, my Android version was 4.2.2, now it is 4.4.4. I thought about starting from scratch and partitioning the drive, dedicating 8GB to NetHunter and the remainder to everything else.

Can anyone tell me what happened to the approximately 20GB of unused space I had and if there is some way I can get it back. FYI: the NetHunter is working perfectly.

Thanks,