Doubling P-tags in comments when edited

I have an oddball situation I’m hoping somebody can shed some light on. I have one installation of WP 2.0.11 that doesn’t remove the paragraph tags from comments when I open them in the editor, and if I save it without removing them, it will double them.

1) Start with [p]text[/p]…
2) Edit comment…
3) Get this [p][p]text[/p][/p]

Any idea how I can address this. I recall an earlier version (2.0.4?) that had a similar issue, but with the duplication of the rel attribute on comment links.

This issue involves a customized version of WP 2.0.11 (my favorite version), and I use it a lot, but this only happens on one site. Naturally that leads me to think it could be plugin related, and I even have a custom plugin for transforming Latin language text (special parsing with lang=”la” attribute), and I did apply that the the comments. I commented out the filter for comments on that one, saved it, refreshed the page and tried edit again, but it had no bearing. I don’t see how any of the other plugins I’m using would play a role since they don’t play with comment_text() at all.

Google and WP search yielded no matches so here I am, asking for help. Not stressing it (it’s not really a huge issue), but I am confused and would like to fix it… it’s the only bug on the site.

In advance, thanks.
Mike