It goes partway down reverses direction and goes back up again.
Garage door closes then reopens.
But changes in weather conditions can causes your garage door components to shift or contract.
Your garage door is programmed to travel a certain distance before it closes.
If you re craftsman chamberlain etc garage door opener is closing and then opening up its likely a common problem related to the stop limit mechanism.
If it closes before that distance has been traveled it thinks something is wrong and it reopens to help prevent any damage or safety risk.
You push the button to close the garage door.