Recording issues

I'm trying to record my students.  I turn off my camera and mic so only the other person is on screen then I press record.  However, every single time, the video starts with my profile picture and then some sound and then goes to the other person.  I want it to start on the other person before the sound occurs.  My camera is already off and my mic is already on mute when I press record.  How can I get it to start recording the other person and not me  at the beginning?