Bulk operation reports wrong number of issues

Steps to reproduce on jiraclone2:

• filter returns 132 issues
• bulk transition to Closed

The confirmation page shows 132 issues, but the progress bar shows 146 issues.

Further information:

• I then bulk changed Labels. Same 132/146 inconsistency.
• after I complete the operations no extra issues seem affected. It looks like only the displayed value is wrong.