I'm currently seeing @tutsmybarreh in yellow in the shoutbox and in purple in Latest Threads block on the right. 10mn ago he was purple in both. I think I've seen this happen to @grrkin a few days ago also.
Yeah - if you hit F5 usually the colours are back to normal after refreshing. And then if you go on the shoutbox archive the colours are screwy again. Lol