[Help] Microsoft Teams offers to transfer call from device that I'm not using

Hello everyone. I was using Microsoft Teams on my cellphone when suddenly the app closed and once I opened it again it gave the option to transfer the call to "this" device (my cellphone which I was currently using) or to stay in the other device. The thing is, I was not using any other device. I do have MT registered on my PC but it was closed.

Has this happened to any of you? Why does this happen?