data folder wrong size readings

Oct 7, 2011
i have recently started using MIUI and noticed interesting fact. my data folder show 91mb out of 147 used. but i have only lookout and profiles app installed in this folder, which make together less than 5mb. the rest i put in to system folder, since there is a plenty of space aviable. i have moved from cyanogenmod and with even more apps installed only around 30mb of data folder was used.
can anyone say what is the problem?