Tujen's purchase progress on an item can be lost

I started a haggle with Tujen, had to come back later cause I didn't have enough of his currency, saw that the whole haggle had reset, I was able to offer lower that I should have been able to. I didn't think much of it, I thought I had to restart the whole haggling thing again and the new "first" offer was obviously refused and he removed the item cause it was too low. Lost a divine, kinda sux, please fix.