That's a shame but it can happen. I have had some good smokes turn out rancid from something I wouldn't describe as ammonia.
I have quite a few Os in my collection, and if I recall this is Oliva's original blend or at least based off of it.
When I smoke them I find cedar to be dominant followed by pepper, both delivered through a smooth chewy marshmallow like consistency.
Haven't had a bad one yet, but I have had some premature Vs fail me. Sorry for your bust.

Thanks for posting and sharing.