[Skimmer]

The problem is here.

pawn Code:

(GetAdminLevel(id) >= 1)

Instead of id, use i.

pawn Code:

CMD:admins(playerid, params[])
{
    new admins, szString[128], id;
    SendClientMessage(playerid, 0x99FF00AA, ""NAME" online administrators.");

    loop(i, MAX_PLAYERS) {
        if (IsPlayerConnected(i)) {
            if (GetAdminLevel(i) >= 1) {
                new PlayerName[MAX_PLAYER_NAME];
                GetPlayerName(i, PlayerName, sizeof(PlayerName));
                admins++;
                format(szString, sizeof(szString), "{EA8015}Admin %s(%d) (Level: %d) (%s)", PlayerName, id, GetAdminLevel(i), staffrank(i));
                SendClientMessage(playerid, 0x99FF00AA, szString);
            }
        }
    }
    if (admins == 0) {
        SendClientMessage(playerid, 0x99FF00AA, "{EA8015}[{C0C0C0}ERROR{EA8015}] No admins connected.");
    }
    else {
        format(szString, sizeof(szString), "{EA8015}[{C0C0C0}INFO{EA8015}] There are currently %d Admins online.", admins);
        SendClientMessage(playerid, 0x99FF00AA, szString);
    }
    return 1;
}