Units always respawn with their "standard" kit, regardless of what they had before they died.
Several options:
* Use
SPON Kits (which does a lot of things, other than just what you want). Maybe overkill for what you want.
* Use a respawn-with-same-gear-you-died-with script (several about...search yourself).
* Add a killed handler to the unit in order to manually reapply the equipment change (where
reequipplayer.sqs is the script that you already have that sets up your equipment correctly):
this addEventHandler ["KILLED", { 0 spawn { waitUntil { alive player }; exec "reequipplayer.sqs" } } ];
First and third options will respawn you with your "initial" kit. Second will respawn you with what you died with. Really up to you which type you prefer.