Accounts Overlapping

My brother and I game share on xbox consoles (series s) the game gives priority to whoever logs on first and forces the other player to sit in the other players lobby, My account is ViperineFlame and as you can see in the attached images the lobby it shows appears as though I was logged in to Shreck5748, however when I click on the profile it pulls up my screen. The ready also flashes on and off if one of us is not readied up. If i leave the lobby it pulls him too, we can not be in the same lobby as each other nor custom games.