nRF52810 hardware General IO output mode working unusual

Question

Hi, 
 I have layout a borad with nRF52810 and use IO to control other ICs.IOs map as blow. 
 #define LSM_6DS_SPI_CLK_PIN 9 /**< SPI */ #define LSM_6DS_SPI_CS_PIN 4 #define LSM_6DS_SPI_MI_PIN 5 #define LSM_6DS_SPI_MO_PIN 6 
 #define LED_2_PIN 18 #define LED_3_PIN 20 #define EN_MOVE_PIN 25 #define EN_SHAKE_PIN 10 
 #define CTRL1_PIN 12 //Red #define CTRL2_PIN 14 //Black 
 My software frame: 
 /************************/ 
 main() 
 { 
 platform_gpio_initialize(); 
 softdevice_init(); 
 while(1) 
 { 
 mycode(); 
 } 
 } 
 /************************/ 
 Here is the platform_gpio_initialize() code 
 void platform_gpio_initialize()
{ 
 /** @brief initialize sensor PIN */

 nrf_gpio_cfg_output(LSM_6DS_SPI_CS_PIN);
 nrf_gpio_cfg_output(LSM_6DS_SPI_MO_PIN);
 nrf_gpio_cfg_output(LSM_6DS_SPI_CLK_PIN);
 nrf_gpio_cfg_input(LSM_6DS_SPI_MI_PIN, NRF_GPIO_PIN_PULLUP);
 
 nrf_gpio_pin_set(LSM_6DS_SPI_CS_PIN);
 nrf_gpio_pin_set(LSM_6DS_SPI_CLK_PIN);
 nrf_gpio_pin_clear(LSM_6DS_SPI_MO_PIN); 

	/** @brief initialize spi flash PIN */

 /** @brief initialize led pin */
	nrf_gpio_cfg_output(LED_2_PIN);
	nrf_gpio_pin_set(LED_2_PIN);
	nrf_gpio_cfg_output(LED_3_PIN);
	nrf_gpio_pin_set(LED_3_PIN);
	
	nrf_gpio_cfg_output(EN_MOVE_PIN);
	nrf_gpio_pin_clear(EN_MOVE_PIN);
	nrf_gpio_cfg_output(EN_SHAKE_PIN);
	nrf_gpio_pin_clear(EN_SHAKE_PIN);
	
	nrf_gpio_cfg_output(CTRL1_PIN);
	nrf_gpio_pin_clear(CTRL1_PIN);
	nrf_gpio_cfg_output(CTRL2_PIN);
	nrf_gpio_pin_clear(CTRL2_PIN);
	
	
	nrf_delay_ms(20);
	for(int i=0;i<7;i++)
	{
 nrf_gpio_pin_set(EN_MOVE_PIN);
 nrf_delay_ms(20);
 nrf_gpio_pin_clear(EN_MOVE_PIN);
 nrf_delay_us(20);
	}
	nrf_gpio_pin_set(EN_MOVE_PIN);
 
 
} 
 After download this code,the bluetooth advertising and connection are working normally. 
 LED_2_PIN LED_3_PIN EN_SHAKE_PIN cotrolling are working normally, but the voltage of CTRL2_PIN is always high (Voltage=1.6V)although I had clear this PIN in platform_gpio_initialize().But if I add nrf_gpio_pin_clear(CTRL2_PIN) in main while(1), the voltage of CTRL2_PIN is 0V. 
 
 So I don't know where is changing the CTRL2_PIN VOLTAGE.