TLC5971 Output is always ON whenever the Board is power

Good day to all,

Please i need your guide and support on how to solve this Problem.I am using 6 Outputs of TLC5971  to control the brightness of 6 Leds.Everything is working well except the fact that the Outputs are always ON whenever I power on the board.Based on the initialisation that i made,I expect the Outputs to be OFF  whenever  I power ON the board.I would be very grafeful if somebody could help me have a look  through my code perhaps my initialisation code is wrong.Below are my lines of code:

void ClearClock()
{
	PORTB &= ~(1 << PB3);  
}

void SetClock()
{
	PORTB |= (1 << PB3);   
}

void ToggleClock()
{
	_delay_us(50);
	SetClock();
	_delay_us(50);
	ClearClock();
	clockcount++;
}

void GenerateLatch()
{
	_delay_us(400);
	
}

void SetData()
{
	PORTD |= (1 << PD6);   // Setzen
}

void ClearData()
{
	PORTD &= ~(1 << PD6);  // Rücksetzen
}


void send_16Bit(unsigned int data10)

{
	int i=15;
	do
	{
		if (((data10 & (1<<i))>>i) == 1)
		SetData();
		else
		ClearData();
		ToggleClock();
		i=i-1;
	}
	while (i >= 0);
}


void InitRegister()
{
	// 0x25 = 100101b
	
	SetData(); ToggleClock();
	ClearData(); ToggleClock();
	ClearData(); ToggleClock();
	SetData(); ToggleClock();
	ClearData(); ToggleClock();
	SetData(); ToggleClock();
	
	
	SetData(); ToggleClock();    // OUTTMG (1=OUTx turned on/off at rising edge of clock
	ClearData(); ToggleClock();  // EXTGCK (0=internal Clock)
	SetData(); ToggleClock();    // TMGRST (Display timing reset mode)
	SetData(); ToggleClock();    // DSPRPT (auto Display repeat mode)
	ClearData(); ToggleClock();  // BLANK (0=LEDs on; 1=LEDs off)
	// global brightness correction

	for (int i=212; i>191; i--)
	{
		SetData(); ToggleClock();
		a++;
	}
	// Greyscale Data
	a=0;
	for (int i=192; i>0; i--)
	{
		ClearData(); ToggleClock();
		a++;
	}
	a=0;
	GenerateLatch();
}


void SendLEDHeader(void)
{
	// 0x25 = 100101b
	
	SetData(); ToggleClock();
	ClearData(); ToggleClock();
	ClearData(); ToggleClock();
	SetData(); ToggleClock();
	ClearData(); ToggleClock();
	SetData(); ToggleClock();
	
	
	SetData(); ToggleClock();    // OUTTMG (1=OUTx turned on/off at rising edge of clock
	ClearData(); ToggleClock();  // EXTGCK (0=internal Clock)
	ClearData(); ToggleClock();    // TMGRST (Display timing reset mode)
	SetData(); ToggleClock();    // DSPRPT (auto Display repeat mode)
	ClearData(); ToggleClock();  // BLANK (0=LEDs on; 1=LEDs off)
	// global brightness correction

	for (int i=212; i>191; i--)    //^191
	{
		SetData(); ToggleClock();
		a++;
	}
}

void SetRegister_1(unsigned short LED0,unsigned short LED1, unsigned short LED2, unsigned short LED3, unsigned short LED4, unsigned short LED5)

{
	
	

	SendLEDHeader();
	send_16Bit(0);
	send_16Bit(0);
	send_16Bit(0);
	send_16Bit(0);
	send_16Bit(0);
	send_16Bit(0);
	send_16Bit(65535-LED5);
	send_16Bit(65535-LED4);
	send_16Bit(65535-LED3);
	send_16Bit(65535-LED2);
	send_16Bit(65535-LED1);
	send_16Bit(65535-LED0);
	
}


int main(void)
{
	DDRB |= 1 <<PINB3; // PIN  B3  Clock Output
	DDRD |= 1 <<PIND6;   // PIN  D6  Data Output
	InitRegister();
	USART_Init(47);
	SetRegister_1(0,0,0,0,0,0);
	
	while(1)
	{
		clockcount=0;
		
		
		
		
		//wait_command();
		
 		UARTReceiver();
	
		
		
		

	}
}//

   Thank you for the  Support.Best regards.