If you have appended the custom group to policy then it wouldnt get change, Have you followed steps given in below blog to set create custom group and map it to policy :
Custom Groups and Policies in vROps 6 | Patrick Kremer
NOTE: I see you have mentioned vrops 6.2 which is already out of support
Available vrops and supported are :
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i have already worked as per the article. I understand that policy attached to custom group does not get changed like that. But this is some sort of misbehaving i guess. Earlier it was not the same and everything is Smooth.
Also i am aware that this version is out of support now but as this is impacting my environment, is there anything that can work for me ?
You need to upgrade to remain supported. This version is too old to provide help on for most.