Leaderboard shows for everyone except first player. How can I fix this?

It might have been declared before the player could actually join. Try adding this line to make sure that your character is in the game. repeat wait() until plr.Character

function playerAdded(plr)
       repeat wait() until plr.Character
       local stats = Instance.new("IntValue", plr)
       stats.Name = "leaderstats"

       local KOs = Instance.new("IntValue", stats)
       KOs.Name = "Kills"
       KOs.Value = 0

       local WOs = Instance.new("IntValue", stats)
       WOs.Name = "Deaths"
       WOs.Value = 0

       local Money = Instance.new("IntValue", stats)
       Money.Name = "Bronze"
       Money.Value = 0

       local XP = Instance.new("IntValue", stats)
       XP.Name = "XP"
       XP.Value = 0
end

game.Players.PlayerAdded:connect(playerAdded)