I cured a villager once, but didn't get the discount I wanted, so I went to cure him again, but the discount wasn't any larger. I have been zombifying villagers multiple times for a bit now and it always works, but just recently I had a problem with this villager. I think it has to do with me curing him and then leaving the area while he cures, and when i come back he is cured but the discount isn't better. This is really annoying because it means I have to sit and wait for him to cure, and I also wasted three apples before I even realized why.