Jobs are getting scheduled and triggering automatically in management console without scheduling.

Hi All,

I am finding a strange issue in management console, i have scheduled my jobs to trigger at 6P.M in server group configuration. and they are getting executed properly on time, but same jobs are getting executed at 5.30 P.M in different configuration like in JOBSERVER1 but that schedule has not been created in my repository. Because this my jobs are getting failed. Kindly suggest me some solution for the same. so many guys are facing the same issue in my team....

Any suggestion is appreciable 

Thanks,

Subbu.