It's a known issue for lj - just go to support: http://www.livejournal.com/support/ and follow the instructions on the related bullet point (if you're still seeing the wrong icon). And I've heard just deleting and reloading the icon fixes it (but when it happened to me, I used lj support and - after a day or two - it was fixed up).

It still seems likely that lj might be breaking.