There can be only one particle of spwn and spwn2 in simulation area. So if there's already one present, you can't add anymore.
However, you can convert other particles to spwn using console or prop tool.
Same applies for stkm and stkm2.
(Note that using prop/ console might give you multiple particles but they won't necessarily work as intended or they might even get deleted the very next frame.)
@Cracker1000! I mean like they spawn multiple and when i try it it doesnt work