Yes happened to me a fair few times. Not sure why when in the same turn i prime the smoke grenade first, then fire. But they explode the other way round. Steve, any rules set about when things explode? Also what if you set something for 2 turns time, and then prime a grenade in turn 2 to explode on 0? What are the rules then?
I agree, the first primed and thrown grenade should explode first. Quite recently I wanted to open up a wall with a grenade and then for a gas grenade to explode afterwards and spread within the building through the open wall, but alas, gas grenade exploded first and the tactic failed.
They explode in the order they were purchased, since that's the order that the equipment records are created. At the end of each turn it goes through all the equipment records in their natural order and checks to see if anything should explode. I'll look to change it so that they explode in primed order.