I am not sure if this is a bug or intended but I think “staggered” status puts someone at the end of the turn order.
I staggered a necrosavant with a hit form a 2h hammer. The next turn the necrosavant was still the first to act.
Pure necrosavant fight, so none of my dudes were staggered.
The ‘Staggered’ status effect puts a character to the back of the turn order for the current round (if still to act), and reduces initiative by 50% for the next round.