ConfigMgr task sequence not updating immediately after modifications

Hi,

I have SCCM 2012 SP1 environment with CU2 update.

My problem:

I am trying to change "apply network settings" step on the TS, so I can place new build machines to a new OU. When I change the settings , the TS does not update immediately. So when I build a machine it applies all the previous settings. I usually have to completely delete the "apply network settings" step and re-create it with the new settings to get it working.

I know in SCCM 2007 the task sequence updates immediately.

Note : Above TS is migrated from  SCCM2007 R2.

Does  experiencing the same issue and come up with a solutions ?

Thank you..