Bug report: when I went to a new user's page, I noticed that the 3rd, 5th, and 7th comments had working up/down vote buttons. Loading a second copy of the page, the buttons were gone. I have a screenshot of it, but no idea how to reproduce it, or why only some of the comments had buttons.

Any idea what's up? (Also, do we have an official spot to post bugs? If I've noticed it, I've since forgotten about it, and if I haven't noticed it, I suspect it's hidden a bit too well.)