I asked him to run these queries and check the values:
select applications_system_name from apps.fnd_product_groups;
select name from apps.wf_systems;
These two had production sid instead of the cloned sid.
I told Sandeep to:
1. Update the two tables with correct values
2. Stop Apache
3. rm $COMMON_TOP/_pages
4. Restart Apache.
Once he did the above 4 steps, OAM started showing the cloned system SID.