Just wondering if anyone has noticed the same "behavior".
I started with 5 weaponcrafting and no recipes (bugged). Managed to get myself a couple of recipes, one axe and two clubs to start grinding with. By the time I hit 10, I had gained all club and axe recipes but am now gaining points and no more recipes. No knives or shovels or picks.
It seems, then, that weapons are indeed divided into groups by type. I have a pick recipe but need to get to 25 to learn it and the only knife I have found was a dud, learned it but didn't actually gain any recipe (bugged).