Glass and plastic bottles can effectively spawn anywhere, as they don't have usages, tiers, or categories assigned in the vanilla types file. Sounds like there's too many containers with not enough of the assigned loot to go around, so the economy places whatever is spare where it can.

@cflynn93 You're right..
Maybe bottles should get a category assigned to them so these 3 item spawn high tier loot points don't end up spawning 2 bottles.

Yeah maybe, I know bottles have always been like that as far as I know. It's usually a sign of having too many dynamic events and not enough deloot to go around lol. Heli crashes spawning bottles is a classic example.