I've been trying to put HTML into the comments for an image. It works, but it also displays a duplicate of some of the text above the comment when you view the image.
Click the top left image in this gallery to see:
It seems to be caused by the HTML... some of it anyway. A bold tag works fine, but an italic tag creates this "echo". Links cause it to happen too.
Here's the HTML for that image:
<b>"King Trout"</b> ~ I've been looking for King Trout for some time in Colorado's rivers... haven't found him yet. (12"x12" panel on 20"x20" background. Mixed media. <a href="http://www.etsy.com/shop/DouglasHunley">$275 + Tax & Shipping. Puchase</a>)