Internal storage issues on lollipop soak test topic

Hey guyss.. I have a problem. I flashed soak test ota zip via twrp recovery..now when i install any app, it consumes a lot of space in the internal memory.. For ex if i have 400 mb used after installing lollipop ota, nd if i flash super su zip then it consumes around 60 to 70 mb of internal memory.. Moreover if i try moving apps to sd card only a part of it is transferred.. Like if i move a 40 mb app to sd card 20-25 mb goes to sd card nd rest is in internal memory. I just want to ask that whether it is a bug or somethng, cuz it never happens on cyanogenmod 12.. Plzz help..