Phantom data taking up storage space

As you can see in this picture (i.imgur.com/Q0ZZdUO.png) my phone's internal storage is about 11 GB, however the combined storage space of everything listed below is less than 6 GB. I know personally that I have not put much of anything onto the internal storage, so what does the phone think is taking up the other 5 GB, and how can I fix it?
I'm using this ROM btw:
http://forum.xda-developers.com/show....php?t=2771440

G900V OC5 OptimalRom: Phantom Alarm / Auto Snooze

Good morning folks,

I have recently had an alarm go off at random times on my rooted / debloated G900v running OptimalRom / Nova Prime. I am not sure what is causing it and there are no notifications or pop-ups allowing me to stop it. I am forced to either mute my phone or restart it.

On top of that, I haven't had a working alarm since I installed my first ROM some weeks ago. I tried enabling/disabling snooze and yet, no matter what, my alarm automatically stops ringing after 3-4 seconds of playing. It has been unreliable and doesn't wake me up in the morning.

I haven't found a clear answer as to why either are happening. Any help is greatly appreciated.

Thanks,
Bryan

Phantom Recent Apps Glitch Google Maps

Hi everyone,

I have this weird glitch on my phone. When I'm using Google Maps, it would randomly open the "Recent Apps" and sometimes even the "Back" button would activate on its own. I initially thought it might have to do with the wireless charging but when I use Waze, I no longer see the phone glitching. Is it a hardware failure? Is it an Android software/Google Maps bug? Does this happen to anyone else?

I'm on stock T-Mobile with Developers Options enabled, and not rooted. According to this thread (http://forums.androidcentral.com/spr...presses-3.html) it's the GPU rendering.