[Threshold]

You probably have something like this:

pawn Код:

CMD:chat(playerid, params[])
{
    new string[128];
    if(sscanf(params, "s", string)) return SendClientMessage(playerid, 0xFF0000FF, "USAGE: /chat [text]");
    new string2[60];
    format(string2,sizeof(string2),"Admin: %s", string);
    SendClientMessageToAll(0xFFFF00FF, string2);
    return 1;
}

Notice how the string we are formatting, is actually less string length than our text length? This is most likely what you have done.

EDIT: Or possibly the other way around