Originally posted by Zep Tepi:

I downloaded a mod called Discard or Recycle Inventory Items after making a second Draugr fang instead of upgrading my current one. It is too easy to hit craft while being in the wrong tab. It works.

If I were using mods that would be one I'd grab in a heartbeat. I've run into this multiple times, comes partially from playing when I'm not alert but I do wish there was an "opt-in" warning popup for when you attempt to create a duplicate of an upgrade-able item you already have. Until then its either grin and bear it or devcommands for me.