Desktop Mac intercepting iPhone calls

I switched to a Mac Studio from an ancient Mac Pro several weeks ago. FaceTime on my Mac Studio keeps intercepting calls that come through my phone, and even callers on my list get cut off, or I have problems answering the calls on my phone.

I have signed out of FaceTime on my Mac Studio, but it's still intercepting calls.

I want to receive my calls on my phone. How do I get the Mac to stop intercepting them?

[Re-Titled by Moderator]