You may need to restart your game. Rucksacks can be changed. Five star engineer of this squad has 2 less mobility points (16) than five star engineer II (18). I think it is manageable.
Yeah. Every time you get a event squad, and maybe premium, they often glitches and you can’t level them up or change their equipment unless you restart the game.
And if you give your guys the extra grenade back pack? You would be looking at an additional 27 molotoves. Making an total of 81 molotoves. If I did my math correctly (which I dislike and suck at)