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Question about current in low power mode.

Hi
softdevice uses s130
The board is using nrf51 dk. The example uses the ble_app_beacon example from sdk12.3.
   if (switch_hit ())
         {
           // NRF_POWER-> SYSTEMOFF = 1;
         // sd_power_system_off ();
          
         sd_ble_gap_adv_stop ();
          power_manage ();
     
         }
I measured the current by adding this part. I normally use 4.5mA, and when I enter the low power mode, it consumes 0.9mA. I thought I would spend much lower. Is this correct? Or am I making a mistake?

For reference, when I tested with system_on_wakeup_on_gpio example in GITHUB, I consumed 20uA when entering sleep mode.
I need your help.
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