[GiamPy.]

Strfind returns -1 when the needle (the word searched) is NOT found. In this case, you inverted the checks.

pawn Код:

new stringtag[128];

if(PlayerInfo[playerid][pTag] == 0) // The server found the player is not part of the clan. Has they got the tag into their name?
{
    if(strfind(Name(playerid), "[KZ]", true) > -1) // If the server does not find the tag, strfind returns -1. That means the following code is not executed.
    {
        format(stringtag, sizeof(stringtag), "%s has been kicked from the Server [Reason: Unauthorized Tag]", Name(playerid));
        SendClientMessageToAll(C_LBLUE, stringtag);
        DelayKick(playerid, 100);
    }
}