Duplicate Log data

[silverzero]

I collecting Heart Rate data using nRF52 and Max30102

I saw data in hyperterminal, it is normal and not show duplicated data, 

but, I connected with my phone and nrf52 DK and look nRF Logger application

I realized they show duplicated data.

I don't know why and  I changed connect interval but it didn't help  solve the problom

[Kenneth]

What data is duplicated? Is it possible that you are receiving data over BLE data is also written to NRF_LOG()?

[silverzero]

I just check data hyper terminal using NRF_LOG_INFO() function.

here's my Logged data. As you can see, the data was seen from hyper terminal is no duplicate but saved data from application is show duplicate. I don't know whyㅠ 

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(500, UNIT_1_25_MS)            /**< Minimum acceptable connection interval (0.5 seconds). */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(1000, UNIT_1_25_MS)           /**< Maximum acceptable connection interval (1 second). */
#define SLAVE_LATENCY                   0                                           /**< Slave latency. */
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)             /**< Connection supervisory timeout (4 seconds). */
#define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(5000)                       /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(30000)                      /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT    3        





int main(void)
{
    bool erase_bonds;
    APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
    //NRF_LOG_DEFAULT_BACKENDS_INIT();
    NRF_LOG_FLUSH();

    // Initialize.
    log_init();
    twi_init();
    MPU2950_set_mode();
    max30102_set_mode();
    timers_init();
    buttons_leds_init(&erase_bonds);
    power_management_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    advertising_init();
    services_init();
    sensor_simulator_init();
    conn_params_init();
    peer_manager_init();
    
    // Start execution.
    NRF_LOG_INFO("Cycling Speed and Cadence example started.");
    
    application_timers_start();
    advertising_start(erase_bonds);
  
    int sample_number = 0;

    // Enter main loop.
    while (1)
    {
        idle_state_handle();
        read_sensor_data(); 
        nrf_delay_ms(70);

  
        NRF_LOG_FLUSH(); 
      
   
      }
      
     }
      

Here's my code  connection parameters interval and main function.

Where should I change? ㅠㅠ 

Also this is log data checked from nRF logger application served from Nordic Semiconductor