Spwan rate particle parameters do not works (but Acceleration is OK)

Hi,

i have a blueprint with particles system as child.
When i try to modify the rate of my particle using particle parameters, it works in the editor.


But when i play my game, my particle parameters values seems to be used only at start and just after start paramaters seems to be set to some default values i don’t know from where.
particle_game
In this pictue, the same rate value seems to be used for all my emitters instead of 100 for two of them and one for the two others.

Note: The “Acceleration Distribution” paramters seems to work well.

Why ?
How can i change the spawn rate of my particle in real time in my game ?