I spend a lot of time in Qeynos hills when starting new characters and have done that quest a lot. I've had some pretty bad streaks too (about 5 or 6) of the same one but I always eventually got the other half so I think you had a really bad luck streak.
If you are into conspiracy theories though, there are two hunter spawn locations. One is the wanderer that comes up to the blackburrow entrance and the other spawns near Surefall Glade.
I never paid attention if either of those had different drop rates of staff halves. So the BB one could drop the bottom half 75% of the time and the SFG one drop the top one 75% of the time, you could get very streaky if you kill the same one each time.
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