To reproduce, follow the link to https://secure.phabricator.com/D16655#196360 or D16655#196360 (I got the link by clicking on the date of the comment)
The browser seems to scroll to the highlighted comment but then continues to scroll and ends up somewhere else.
I would expect it to just show the selected comment.
Tested with firefox 45 and chromium 53
(The issue is with all differentials, also on my install. D16655 is the first one I could find with a comment)