You can only forge bars. You need to smelt them first! I will add a better tooltip to indicate that.
i get that, i said forge but i mean't smelt which guess what, i also can't do it happens the exact same thing
you need 9x ore
guess what, i did get 9 ore and still show "insuficient ore"
Have you tried again? Some of the ores required x10 (for example iron) and now everything should cost 8x ore. I released a patch 1 hour ago.