Lump war horn issues?

Anyone have this happen? I passed the deception check to get lump’s horn (promised him gold later). I used it one time at the Zhentarim/gnoll fight, and then at the end of the fight got caught in a cutscene talking to the caravan guards. By the time the conversation it was over, the ogres had just left.

Now when I blow it, my Tav says something like “the deal is done nobody’s coming”.