So I unlocked the Axe and Falchion a couple of weeks ago and have been using it for a while.
This morning when I logged in, not only is the weapon now missing from my inventory but there’s no option to craft it as well. In the challenges, it’s showing as the reward having been claimed.
This should be a steam issue (has happened before), game doesn’t know if the DLC is unlocked without steam giving it the ok, so it locks them. Should resolve itself, you just have to wait a bit, maybe look up if steam has problems in region at this moment.