If it doesn't click in all directions I would suspect a manufacturing defect and worth taking it up with support.
Stick broken here... controller low cost
My thumbstick broke after using it on one game...
Hello @bertlacy,
Since this is an old topic, we're going to go ahead and lock it. If you still need assistance with your Stadia Controller, please start a new topic and we can help you out there.
Thank you,
James