The X position is in the middle but why not the Y position?

[GTFoxN6Y]

I was trying to make a hyper combo Finnish background go in the middle, but when the player jumps up, the background STILL on the ground and the Y position IS not in the middle completely.

 

I tried to use this code:

[State 0, PosAdd]

type = PosAdd

trigger1 = 1

x = 0

y = 0

;ignorehitpause = 1

 

but that`s don`t work. Can you show me how to force the Y position in the middle?

Edited June 8, 2020 by GTFoxN6Y0899