There are a few versions of the Redmi 2:
According to the MIUI forums and XDA:
wt88047, 2014811 or HM2014811 - international 1 and 2GB versions
2014818, HM2014818, or HM2LTE-IN - Indian variant
2014813 or HM2014813 - Chinese variant
See if you can find any of these numbers in your "About...
This should be normal.
Your phone's storage space is divided into several partitions. The Android operating system has its own partition ("/system") separate from your files, photos etc. ("/data")
Unless you repartition the device still will not change.
On my 32GB Redmi 4X I have a little...