This is wierd. I also have gm carp, arms lore and made bokutos with ash and get 40% DI, 10% ssi, 20% lower requirement. When my imbuer (120 imbuing, gm item id) unravel them at Queen forge, he only got residues. Same thing happened to bloodwood, oak and yew bokutos.
I even tried to use soul stone to remove imbuing skill and put it back, didn't help. Put arms lore on the imbuer, didn't help.
I am clueless!