Iphone 5S memory usage glitch?

I'm trying to update to iOS 8 and it says I need space. So I go to my usage setting and it says I'm using 11.7 GB and I have 1.2 GB remaining. What I don't understand is the largest App I have is twitter and Facebook and they each have only 500 MB a piece! The rest of my apps all have 300 or less MB per, and no I don't have 25 apps with 300 MB I literally added it up and got maybe 4 GB used and I rounded up generously. Could someone please explain how 9 gigs of data have gone missing? There's literally no explaination for this. Someone please trll me what I'm missing here, how can I have so little space when nothing is using it? Please helpIphone 5S memory usage glitch - 1

You need 4.7 GB to update and if there are games, some will take up more space when progression through the game

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