Replication problem in domain controller

Last modified date in number of policies is different in Domain controllers.

In a particular DC ,last modified date is 2011 and in other DC's the same policies last modified date is 2013.I ran repadmin and checked event logs.There is no problem in replication, created a file in the problematic DC and it got replicated to other DC's.

Is it possible of policies having different modified time in different DC?

Thanks,

Vijayaragavan S