Look at this question. I was trying to replicate the issue. But while doing that I found a new bug!
I suspect this issue occur only for 2K+ users.
The issue is:
As we know when we click on edit link of any post, it does not redirect to new page (for 2K+ users only). But when we click more than one time immediately before text-area is shown (as more as we can click), then cancel it. You will see the text-areas (Yes s) of edit remain there more than once.
These text-areas are increased if we again click (more than once) on edit at this situation and cancel it!
I tried it in Chrome, IE, Mozilla and Opera. This occurs in all of these browsers.