Figured I'd start a list, I've noticed this a number of times but never kept track.

Robust Kaedweni Sword diagram creates Robust Short Sword (far worse item)

Doesn't Solid Cloth diagram create Robust Cloth

Or is it the other way around?

http://www.gog.com/en/forum/the_witcher_2/bug_robust_kaedweni_sword_diagram

You got it right. You can however see in the tooltip that it creates Robust Cloth. I think there is also the Rage diagram which displays Fury trap at the tooltip.

But these 2 are different from OP's case.

I'm still annoyed at the 'Beehive bomb' mention when Geralt meant 'Grapeshot'.

That drove me INSANE trying to track it down to complete the quest.

Never noticed this bug before though - only the 'values for damage and armour' changing when you craft an item from what the design initially stated.