Dear Kenalix,
I must apologize, this issue is actually my fault. I’ve added a function in the theme files to render post thumbnails in rss feeds, and that function also happens to strip the formatting from the feeds. I will definitely include this into the next theme update, yet in the meanwhile you can download this file, unzip it, and upload into the theme folder (wp-content/themes/Origami), replacing the original file.
Thanks for reporting!
Sincerely,
Andrew | Satori