Do you add a Correlation engine as a Datasource on your Receiver or as a Datascource on your ESM? After you create a Correlation engine you need to rollout all Correlation rules on the Correlation engine.
I can see the correlated events at Correlation Engine and ACE too. But the events on the ACE are delaying too late to show at Esm Web ui. (4-5 hours later i can see the correlated events)
You should open a Support Ticket for this. This is not normal.