MySQL database size in statistics is bigger than real when using InnoDB engine

[Franky@]

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PRODUCT, VERSION, MICROUPDATE, OPERATING SYSTEM, ARCHITECTURE
Plesk Panel, 10.4.4, #50, Centos 6.4, x64

PROBLEM DESCRIPTION
Statistics page reports a database size that is almost doubled when using InnoDB engine in MySQL.

STEPS TO REPRODUCE
Create a database and fill it with data.

ACTUAL RESULT
Database reported size is almost double than real (verified on command line using du -sh on database directory).

EXPECTED RESULT
Database size should be reported correctly.

ANY ADDITIONAL INFORMATION
Changing the table engine to MyISAM solves the problem.
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[Franky@]

This is the screenshot taken from statistics page using InnoDB engine:

and this is the real database size on disk:


Same as above using MyISAM: