Issue Summary

This is reproducible on Data Center: (yes)

Steps to Reproduce

1. Create an issue
2. Add couple of different comments to the issue
3. Add 50 indifferent comments to the issue. You can use following script:

   seq 1 50 | xargs -P 8 -I "$" curl -D- -u admin:admin -X POST --data '{"body": "This is a comment regarding the quality of the response."}' -H "Content-Type: application/json" http://localhost:8090/node1/rest/api/2/issue/YOURPROJECT-YOURISSUEENUM/comment
   

1. Open All activity tab

Expected Results

The All activity tab displays all comments including the different comments from step 2

Actual Results

The All activity tab doesn't display different comments from step 2

Workaround

Ordering needs to be changed to the Newest First.