Deformer Brokes Shape

Hi I hope someone can help me with a problem.

I trying to follow a tutorial, but every time I try to rig with deformer the shape broke into a weird glitch.

Also not sure if it is related, but some times I the box for the transform options disappear

I upload a winrar file with the project if helps: Microsoft OneDrive - Access files anywhere. Create docs with free Office Online.