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If you have moved photo's and music etc then a file called thumbnail will have been left behind so you will need to delete this - To do this open your file manager and select to show hidden files and folders and then the file should be visible then delete it
What is your firmware version?
Check in setting> about phone>Build Number
If it is 15.A.2.1.17.. This firmware has Device memory issue..
Then Update to Latest firmware using Sony Pc Companion / Sony Update service (Via PC)or Update Centre in mobile..
this device memory issue is a problem with two firmware build no. 15.0.A.1.36 And 15.2.A..1.17
to get rid of this problem kindly update your firmware..
if you are an indian user..
the latest firmware is 15.3.A.1.14
update via pc companion or sony update service