Upgrade demanding 1/2 resource not accepted while having the resource

(Playing in french, in case of localisation issue).

Trying to upgrade a sword at the blacksmith level 2:

  • the upgrade requires 1/2 bear paw and 1/2 silver bar (among other resources) the lines requesting the 1/2 resources are red (while the whole resources are green) and the upgrade is not possible.

  • but the requested red elements are available in my inventory.

  • same issue with some cooking recipees demanding 1/2 resource

I realised my mistake - the 1/2 means 1 available out of the 2 required. But the size of typo tricked me (I should have realised half a ressource was stupid) - my bad.
Minor bug in the end.