Aligning Thumbnails in RSS Feed

I upload images to my posts through the WP gallery uploader and select them to be shown as thumbnails. When they show in my RSS feed (which goes through Feedburner) these thumbnails all show up in one vertical column aligned left. I don’t see other feeds with this issue so I’m not sure what I’m doing wrong. I’m viewing these with Google Reader and Bloglines.

Is this a case of setting styling somewhere for my RSS feed? Where? Is there a plugin I can use that I haven’t seen (Align RSS Images doesn’t work for thumbnails). I thought this would be a common issue but I haven’t found any answers on the forums.