Search cluster operator drill down issue

I searched the error events and use the "cluster" operator as below:

error | cluster | table cluster_count _raw

I got a list of clusters with the size of each cluster as below:

1   98  192.168.11.37 - - ..." 2899 4035
2   4   Apr 13 15:03:10 1.1.1.1 ... (2006-04-13 15:02:40)<000>
3   12  Jan 14 09:47:14 ...(2005-01-14 09:48:21)
...

Now I click the cluster size (98) to look for the 98 events in that cluster, however, there is only one event displayed. Is there anything I did wrong?

LL