Multiple object animated on one spline

Hello world,
I need your attention, and your help.
For a project i have to animate a waste conveyor, and i have a little problem. I’m a beginner with the blue print Visual scripting.
I have two big problems :
I would like to animate the metal bars that carry waste, but when i launch my script, only one of them start, and he start from the begining of the spline. (
I would like it to start at his initial position ) Thanks for your help