Kits and Qt Versions names registered with additional running number when installing via maintenance tool

Qt Creator's Kits and Qt Versions names are registered with additional running number when installing\updating Qt versions via maintenance tool on top of existing installation. For first Qt installation via online installer Kit names are correct. Additional Qt installations via maintenance tool will have running number at the end of Qt Version name resulting e.g. Qt 5.6.0 clang 64bit2, iphoneos-clang Qt 5.6.0 for iOS2 etc. Please see attached screen captures.

Steps to reproduce:

• Install Qt 5.5.1 via online installer (e.g. desktop, Android and iOS binary packages) as a new, fresh installation.
• Install\update existing installation with Qt 5.6.0-rc via maintenance tool (e.g. desktop, Android and iOS binary packages).

Please find full installation log as attachment.

This seems to be purely cosmetic issue without regression to actual functionality. Old Qt Creator settings were removed from user directories before reproducing this problem on OS X 10.10 and Windows 7. Linux installation (on Ubuntu 14.04) seems unaffected.