Blacksmithing - Artisan Blacksmith's Hammer

So I can create an R5 of this with a little concentration. When a guildy put in an order to recraft this from R4 to R5 I couldn’t do it. I can’t figure out why. I can do R5 from first craft but only R4 on a recraft. Anyone have any ideas as to why?

Recrafts have to make up for using lower-grade materials if they were used in the original crafting, and can’t replace 100% of lower-grade mats at a single recraft. It can take up to three recrafts with all top materials to replace all all lower-grade mats in the input item.