Default /storage/emulated please enlighten me up

guys,

does your phone have this also?
mine has 848mb free space, (image1)


and it differs from internal storage free which has 7gig free (image2)
and external sd with 4.6gig free (image3)

cause i have a problem on the reading of the free mb on internal storage on my pc (6gig free) and my phone (7gig free). (image 4 and 5)

well i can still copy files to internal sdcard but once the reading on my pc reach 0mb but when in fact i still have 1gig free on phone i cant copy
data. so what i did is copy on external sdcard and with root explorer move the files to internal memory.

another problem is that when the pc reads my internal memory to 0mb i cant import contacts cause it says full memory.
when in fact that i still have 1gig memory.

i have this problem on .290, .257 and .534 firmware
but the difference in reading is decrease from .290=1gig, .257=600mb, and .534=200mb (pc vs.phone reading).
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Xperia Z1 running mharckk v1
Xperia S running mharckk v2
PROUD USER OF XPERIA PHONES -_-