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Vishnu_SFDCVishnu_SFDC 

Scheduled apex jobs are not running properly.

some scheduled batch jobs  show up in the scheduled jobs list as completed but are missing in the Apex jobs page. These batch jobs are not even beng executed.
Ramu_SFDCRamu_SFDC
The below post might give you some clue.

http://salesforce.stackexchange.com/questions/15003/scheduled-job-does-not-execute-though-shows-in-gui