FaceTime call answered on another device

I am not logged into any other devices I got a call that was about two seconds long it rang and it disappeared and I went my call log it was not under missed calls or anything but it said answered on another device which I’m not logged into any other devices is there something I should do like reset my passwords or something. I did call them back and said hey you called me and they just denied it and kept trying to call me back and I didn’t answer and just blocked them