DHCP lease / renewal time is not immediately effective

[VKR V]

I have some scopes under shared network with min-lease-time of 172800, global parameter is different. But hosts for that scopes sometimes gets IP for less than 172800. Any clue why?
   
  When I increase min-lease-time for that scope to 345600, the hosts when sending the renewal request gets different IP (one-lease-per-client is not configured) with lease time of 345600.
   
  Any clue why the DHCP is behaving that way?
   
  -VK
 
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