MUC constantly showing new posts

In Adium on Apple laptop, our groups always show new content, new posts, new lines, no matter what, even when theyre not new. As you can see from the attached image, it shows approaching 200 new lines to be read, but those have been seen many times, which is interesting it keeps showing them as new. If you view them, to get the unread count to go away (the bold count) will disappear, but only temporarily. Any advice on why? Thanks all.

Jason Sjobeck

www.sjobeck.com