per-section editing clobbers random section

Hello,

I've seen this twice on Wikipedia:Votes for deletion:

If a section (denoted by equals signs) is edited by
clicking the link that says "[edit]" at the right-hand
margin (i.e., not editing whole page), when the section
is saved, the saved text clobbers some other section at
random.

Here are two examples:

http://en.wikipedia.org/w/wiki.phtml?title=Wikipedia:Votes_for_deletion&diff=4231218&oldid=4230738

http://en.wikipedia.org/w/wiki.phtml?title=Wikipedia:Votes_for_deletion&diff=4029439&oldid=4029405

It seems like a pretty serious bug to me; its presence
pretty much obviates the usefulness of the per-section
editing scheme.

Thank you very much for your attention to this issue. I
appreciate your help very much!

Robert Dodier