so for some reason when the project starts, the car moves up
can you help me fix it plz.
here is the link https://scratch.mit.edu/projects/395646685/

Not shared by the look of things.

i shared it now

Well if you only call Render Car once rather in a forever loop the y position changes to 54 so why is that?

Looks to me like you need to ensure y is the same at the end of the custom block as it is at the start.