[Kindred]

pawn Код:

for(new i=0; i<MAX_PLAYERS; i++) 
                    { 
                    SendClientMessage(i,COLOR_YELLOW,"• Toate masinile au fost respawnate ! •");

OBVIOUSLY, it's because you have it INSIDE the loop, therefore it will right the message in the chat x amount of times (x being MAX_PLAYERS).

Place it outside the loop.