Okay I think I've found the problem. This post http://www.bomentre.com/?p=1361 has an open div tag right before the read more link that isn't closed. You'll need to edit the post then switch to the html view to see the tags and either close the div before the read more link or remove the open tag and move it after the read more link. This is the text that I'm talking about.

After a little research it looks like that might have been adding by the WYSIWYG editor or wordpress, maybe switch over to the code view and looking for the code will work. If not you might have to cut the text out and paste it into notepad and then paste it from notepad back into the editor of wordpress to get rid of the hidden code.

Hope this helps.