AD Membership based application install

Hi

I have configured application based install where application need to be installed by reading AD site membership if it exist it will install office 2010 and if does not exist it will install office 2013.

have implemented solution using this

http://www.windows-noob.com/forums/index.php?/topic/1782-how-can-i-deploy-applications-based-on-ad-security-group-membership-for-computers-using-a-task-sequence/

issue i am facing is if Condition Appinstall is true it installs office 2010 correctly and when its false it installs office 2013 however somehow it uninstalls after TS completes and gets back to Office 2010.

Any Clue ?