iPhone Free space difference

My Iphones says I have 14gb of free space but itunes says I only have 8gb free what could be causing this.
It's an 5s on jailnroken on 7.1.2 if that makes any diference?

My iPad has a similar problem.

Thanks for any help.

I posted this in a different section but nobody was able to offer any opinions.

braddick said:

Winterboard Themes will take up more room than expected.

-I'd load phoneclean on your desktop, plug in your iPhone, and check the graph that application provides to find out exactly what it is that is taking up so much room.

Click to expand...

Phoneclean now seems to costs $30 didn't it used to be free?

I used icleaner pro that seems to have done the job.