Recently and very rarely, we get a comment that shows up in the RSS feed for posts. The RSS feed we're using is the standard http://www.yoursite.com/feed method so its all WordPress, nothing custom.
When a comment shows up in the posts feed, I've 100% verified that it was indeed a comment and typically the first comment made.
This has happened on occasion from 2 separate hosted WordPress sites we run. One uses 2.8.4 and the other uses 2.8.6.
Any advice is greatly appreciated.