Inventory bug

[Kagen]

I don't have any weapons-grade steel in my inventory. It vanished! It should be there. I am saving things up for an Apology and now I have everything I need - well, I SHOULD HAVE.

This is everything I gathered the last week
1 Cut gem
1500 Weapons-grade steel
5000 Sculptures
5000 Statues
1000 Bronze mask
2 Kingslayers

I have in my inventory:
1 Cut gem
0!!! WGS
5679 Sculptures
9919 Statues
1004 Bronze masks
2 Kingslayers


And before one makes a guess: I haven't built anything that contains WGS and I haven't sold it.