Alchemist: Inconsistent Durations in Smoke Bomb Tree

[Applied_People]

Smoke Bomb duration: 1 rd/lvl
Stink Bomb duration: 1 rd
Poison Bomb duration: 1 rd/lvl
Plague Bomb duration: 1 rd/lvl
Greater Plague Bomb duration: 1 rd/lvl
Inferno Bomb duration: 1 rd/lvl

Is this simply a typo?

And if not, what is the reasoning for the 1 round duration of Stink Bomb (in contrast to 1 rd/lvl for every other bomb in the tree)?

[Zwordsman]

My assumption is because pathfinder tends to limit status debuffs pretty strongly for not spell casting.

otherwise no clue.
Would be nice though if it lasted longer but i'm prett sure it isn't a typo