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


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.
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 ?