Why doesn't the value increase by one all the time, it varies?

game.Players.PlayerAdded:Connect(function(player)

    local messageService = game:GetService("MessagingService")
wait(5)
messageService:SubscribeAsync("ClanSystem", function(message)
    messageService:SubscribeAsync("ClanSystem1", function(message1)


            if player.Name == message.Data and player:WaitForChild("ClanSystem"):WaitForChild("ClanInvites").Value  < 5 then

                print("You have been invited to the "..message1.Data.." Clan")
            end

            if player.Name == message.Data and player:WaitForChild("ClanSystem"):WaitForChild("ClanInvites").Value  < 5 then
                player:WaitForChild("ClanSystem"):WaitForChild("ClanInvites").Value += 1
            end

    end)
    end)
    end)

The value first increases by 1 then increases by 2 and etc