Comment stripped all CSS formatting

I got a scare a few days ago. I submitted a comment on my blog and then when it reloaded the page all formatting was lost! The background colors, header stripe and fonts were no longer in use. It was just all white background, black text, and red links (a stark contrast to the 2 blue backgrounds I normally have). I loaded up the home page and it was the same way. I immediately went into the admin panel and deleted the comment and everything was back to normal.
I’ve tried to replicate the problem but all comments seem to work fine now. The comment-related plugins I have are a couple of Kitten’s spam plug-ins and WP Grins. I was thinking it might be related to the Grins plug-in as that was the most recent one I installed (and several comments had worked fine before that with Kitten’s plug-ins installed). The comment I had made when the problem occurred included a name, e-mail, and URL in the appropriate fields and a grin icon in the message. Has anyone encountered this problem? Is there some fix I can do to prevent this from happening again or was it some sort of random glitch?