Thank you for noticing this and my apologies for the bug. While developing the theme, I envisaged each post having one category and several tags, yet obviously there may be cases when several categories are needed. I’ve added the fix to the post meta tags to the next theme update (version 1.0.3) and finally submitted the update to ThemeForest – it should be up in a couple of days, and if you want I can remind you when the update is available.
The ThemeForest administration has published my update of Origami (ver 1.0.3) today, which means that you will now be able to download it from your account, “Downloads” tab. The new version, among other things, contains the multiple category tag fix which I mentioned above.
Feel free to contact me should any other issue pop up!