[Jefff]

Your variable new TutorialActor[MAX_PLAYERS][3]; is 0 on start and actors start from 0 so:

if first player connect TutorialActor[playerid][0] = CreateActor(); Actor ID 0 (all ok)
then second player is connect (his variable is 0 TutorialActor[playerid][0]) and actor ID 0 is destroyed DestroyActor(TutorialActor[playerid][0]); in OPC for Player 1 ( now actor is owned by player 2 )

if third player connect actor ID is still 0 and variable TutorialActor[playerid][0] is 0 so again you destroy friend id 2 actor

Solution:

In OnGameModeInit set array to INVALID_ACTOR_ID;

pawn Code:

new tempActorID[sizeof(TutorialActor[])] = {INVALID_ACTOR_ID, ...};
for(new i = 0; i < sizeof(TutorialActor); i++)
    TutorialActor[i] = tempActorID;

and for destroy actors

pawn Code:

if(TutorialActor[playerid][0] != INVALID_ACTOR_ID)
{
    DestroyActor(TutorialActor[playerid][0]);
    TutorialActor[playerid][0] = INVALID_ACTOR_ID;
}