IPhone 4 64GB shows as 32GB?

I've just restored my iPhone 4 64GB to custom firmware (starts with NO_BB) on iTunes and noticed it's now showing as a 32GB device. I know that normally I should see about 3GB disappeared but before restoring it was showing 45GB available. After the restore and jailbreak, it's now showing 25GB free.

Anyone ever seen this before and have any ideas on what to do?

* I'll pick a best answer for anyone that finds the fix, within 5 minutes you'll get the points. *

There's no iPhone 4 64gb version
the iPhone 4 has only come in 8, 16 & 32 gb versions.

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