Target Computers not updating in Automated Patch Deployment

Target Computers not updating in Automated Patch Deployment

Hi,

I have a custom group, an automated deployment and a deployment policy....all working fine.  If I add more computers to the custom group they are not appearing as targets under the automated deployment (I'm only seeing the original number of PCs and not the added number). 
I have gone into the automated deployment task and removed the target and then reapplied but not joy.  The computers are appearing correctly in the custom group but that number (the new added computers) are not appearing inthe automated deployment task.

Any idea why this is not happening, I've tried a re-synch with AD but there should be no need as the group is a custom Manage Engine group?  Is there something else I have to update/synch?

thanks in advance.

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