iPhone storage bug

I was trying to update to iOS 7.0.6 today, and I received a warning that my phone didn't have enough free space to install the update. I thought that was pretty odd, as I don't really keep too much on my phone. So I checked my storage details, first from the phone and then from iTunes... And turns out my phone is wrong.

From my iPhone's settings:

And from iTunes:

Anyone else have this problem before? It's bizarre. And any ideas how to fix it?