Странное поведение

#include <amxmodx>
#include <fakemeta>

#define fm_get_user_team(%0) get_pdata_int(%0, 114)

enum _:VoiceMaskTypes
{
	AUDIABLE = 0,
	SERVERBANNED
}

new g_iClientSettings[MAXPLAYERS + 1][VoiceMaskTypes];

public plugin_init()
{
	register_plugin(PLUGIN, VERSION, AUTHOR);
	
	register_event("VoiceMask", "EventVoiceMask", "b");
	
	register_forward(FM_Voice_SetClientListening, "FwdSetClientListening");
}

public EventVoiceMask(id)
{
	#define AUDIBLE_PLAYERS_INDEX_BITSUM		1
	#define SERVER_BANNED_PLAYERS_INDEX_BITSUM	2
	
	g_iClientSettings[id][AUDIABLE] = read_data(AUDIBLE_PLAYERS_INDEX_BITSUM);
	g_iClientSettings[id][SERVERBANNED] = read_data(SERVER_BANNED_PLAYERS_INDEX_BITSUM);
}

public FwdSetClientListening(iReceiver, iSender, bool:bListen)
{
	if (!is_user_connected(iSender) || !g_iClientSettings[iReceiver][AUDIABLE] || g_iClientSettings[iReceiver][SERVERBANNED] & (1 << (iSender - 1)) )
	{
		return FMRES_IGNORED;
	}
	
	static iReceiverTeam; iReceiverTeam = fm_get_user_team(iReceiver);
	static iSenderTeam; iSenderTeam = fm_get_user_team(iSender);
	
	if ((iReceiverTeam == iSenderTeam) || (is_user_spectator(iReceiverTeam) && is_user_spectator(iSenderTeam)))
	{
		engfunc(EngFunc_SetClientListening, iReceiver, iSender, true);
		forward_return(FMV_CELL, true);
		
		return FMRES_SUPERCEDE;
	}
	
	engfunc(EngFunc_SetClientListening, iReceiver, iSender, false);
	forward_return(FMV_CELL, false);

	return FMRES_SUPERCEDE;
}

stock bool:is_user_spectator(iTeam)
{
	if (iTeam == TEAM_UNASSIGNED || iTeam == TEAM_SPECTATOR)
	{
		return true;
	}
	
	return false;
}