Durability still imbue weight bugged?

[Mr. Smither1]

I was imbuing a cyclone that I reforged and it came out with 40di, 100% fire damage and 90 durability. I used pof it to 255 then I pulled it up on the imbue menu planing to put 50 fire area, 37% mana leech and rest of the weight to hit fireball. I imbued mana leech to 37% and item showed 270 imbue weight, I went and got raptor teeth and went to imbue fire area and item now shows 1090 imbue weight. 90% durability was showing 90 imbue weight then after I did one imbue it became 900 imbue weight. I was thinking to use this weapon for low level undead and ratman spawns(conjour's trinket and vermin slayer tallys) and not have to repair it as often.