Puzzled by android math on internal drive space

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http://www.mobileread.com – I just moved Audible to external card, which is close to 5 GB used space! I did tell the App to store in external drive, but it still showed up in internal drive. Here is what my drive says now: Samsung internal drive 339.4 mb available used 5.04 gb 5.38 capacity android 21.1 mb backups 113.6 mb DCIM 573 kb ebooks 16 kb external sd 49 kb fonts 4.8 mb image 1.6 mb mantano 6.9 mb manual-pcprogram 77.8 mb How can that be? Is there a way to cleanup the wasted space? Maybe I am math challenged :chinscratch: (HowTos)