Numbers beside players

Can someone explain to me what the 1 through 4 numbers are for? This change happened recently. I will have a number and then 3 other players on the team will have numbers. It is not a team that assembled before the match.

You mean on the scoreboard? That’ll be group stacks, players teaming up to play together.

if you don’t want to be in a team with other random people you can turn it off right above the start match the same way you pick join any army