I can't get callback when I call second pstorage clear function.

Question

Hi, 
 
 I want use 3 block flash. each size is 16bytes. My code as below 
 int main(void)
{
 check_ant_gpio_mode();
 
 if(factory_dm_mode == 1)
 {
 power_check();
 sense_gpio_init();
 control_uart_init();
 
 adc_configure();
 
 //Peer manager init,then we can connect BLE
 peer_manager_init(true);
 
 utils_setup();
 softdevice_setup();
 
 factory_control_dynamometer();
 }
}

void factory_control_dynamometer()
{
 uint32_t err_code;
 static uint16_t omega = 0; // angular velocity to be set, unit is rpm
 
 while(1)
 {
 if(start_test == 0)
 {
 start_test = 1;
 
 pstorage_data_init();
 pstorage_torque_0_clear();
 pstorage_torque_w_clear();
 pstorage_torque_i_clear();
 }
 }
}

static void example_cb_handler(pstorage_handle_t *handle,
 uint8_t op_code,
 uint32_t result,
 uint8_t *p_data,
 uint32_t data_len)
{ 
 if(handle->block_id == pstorage_torque_0_wait_handle) 
 { 
 pstorage_torque_0_wait_flag = 0; 
 } 
 else if(handle->block_id == pstorage_torque_w_wait_handle) 
 { 
 pstorage_torque_w_wait_flag = 0; 
 } 
 else if(handle->block_id == pstorage_torque_i_wait_handle) 
 { 
 pstorage_torque_i_wait_flag = 0; 
 } 
}

static void pstorage_data_init(void)
{
 uint32_t retval;
 
 //1. torque_0 array: 16x4 => 2 x 18 x 2bytes + 2 bytes header => 74 Bytes
 //2. torque_w array: 2x2 => 2 x 2 x 2bytes + 2bytes contact + 2 bytes header => 12 Bytes 
 //3. torque_i array: 2x2 => 2 x 11 x 2bytes + 2bytes contact + 2 bytes header => 48 Bytes 
 
 param.block_size = 16; 
 param.block_count = 3; 
 param.cb = example_cb_handler; 
 
 retval = pstorage_register(&param, &pstorage_handle);
 pstorage_block_identifier_get(&pstorage_handle, 0, &block_torque_0_handle);
 pstorage_torque_0_wait_handle = block_torque_0_handle.block_id;
 
 pstorage_block_identifier_get(&pstorage_handle, 1, &block_torque_w_handle);
 pstorage_torque_w_wait_handle = block_torque_w_handle.block_id;
 
 pstorage_block_identifier_get(&pstorage_handle, 2, &block_torque_i_handle);
 pstorage_torque_i_wait_handle = block_torque_i_handle.block_id;
}

static void pstorage_torque_0_clear(void)
{
 uint32_t retval;

 pstorage_torque_0_wait_flag = 1; 
 retval = pstorage_clear(&block_torque_0_handle, 16); 
 while(pstorage_torque_0_wait_flag) 
 {
 //nrf_delay_ms(10);
 } 

}

static void pstorage_torque_w_clear(void)
{
 uint32_t retval;

 pstorage_torque_w_wait_flag = 1; 
 retval = pstorage_clear(&block_torque_w_handle, 16); 
 while(pstorage_torque_w_wait_flag) 
 {
 //nrf_delay_ms(10);
 } 

}

static void pstorage_torque_i_clear(void)
{
 uint32_t retval;

 pstorage_torque_i_wait_flag = 1; 
 retval = pstorage_clear(&block_torque_i_handle, 16); 
 while(pstorage_torque_i_wait_flag) 
 {
 //nrf_delay_ms(10);
 } 

}
 
 When I call pstorage_torque_0_clear(). I can get flag change from callback function. 
 but then call pstorage_torque_1_clear(). I can not get flag change from callback function. 
 I think the callback function did not enter this. Why?