AS doesn't display correctly the number of attachments added per revision

I've tested this on incubator.myxwiki.org based on XWIKI ENTERPRISE 4.1-20120711.182831-314-NODE2

The problem is that the Activity Stream doesn't correctly display the addition steps I did when I uploaded the attachments for my proposal. See WrongAttachments.png and WrongAttachmentsExpanded.png

I've also attached summary from the history in order to show what the correct number of attachments that should have been displayed (12, 12, 19, 6, 25, 2).

Mention: I had lots of tabs opened trying to making the screenshots to report this bug. At a certain time I've changed the tab and I've seen CannotReproduce.png which represents correctly the number and the order of the attachments (I'm glad I did a screenshot). The problem is that refreshing the page resulted again in the displaying of WrongAttachments.png and I actually couldn't reproduce again the 'correct state'.