[ConnorMcLeod]

Make sure no task exists when you set a new one (just send remove_task)

Also, use get_players and cstrike module avaible natives (cs_set_user_bpammo).

PHP Code:

register_logevent("startround",2,"0=World triggered","1=Round_Start")

public startround() 
{
    if(enable) 
    {            
        if(trueround)
            round++
            
        trueround = false
        counter = 30;
        remove_task(412566)
        set_task(1.0, "countdown", 412566, "", 0, "b")
    }
}

public countdown(task_id)
{
    set_hudmessage(255, 20, 0, 0.10, 0.50, 0, 1.0, 1.0, 0.2, 0.2, 1);

    //if(counter-- >= 0)
    if(--counter > 0)
    {
        show_hudmessage(0, "%d", counter);
    }
    else
    {
        remove_task(task_id)
        new players[32], inum, id
        get_players(players, inum)
        for(new i; i<inum; i++)
        {
            id = players[i]
            if( is_user_alive(id) )
            {
                if( cs_get_user_team(id) == CS_TEAM_T )
                {
                    give_item(id, "weapon_knife");
                    give_item(id, "weapon_deagle");
                    cs_set_user_bpammo(id, CSW_DEAGLE, 35);
                    give_item(id, "weapon_m4a1");
                    cs_set_user_bpammo(id, CSW_M4A1, 90);
                    set_user_godmode(id,1);
                }
                else
                {
                    set_user_health(id,10);
                    strip_user_weapons( id );
                    give_item(id, "weapon_knife");
                    client_print(id,print_chat,"freeze!");
                }
            }
        }
    }
}