Code not working as expected in sprite lab

Hi,

plz check the following project. https://studio.code.org/projects/spritelab/gRNhYgrBKUXq95IVG-4gjzrUqvS2gibjg9DM-Httgv0

the car sprite is not moving when the green sprite is clicked. the similar code is working in another account. Also, for the same code sometimes the car doesnt stop when red sprite is clicked.

plz help.
thanks,
fatima