why scan by nRF UART can not find bluetooth device in some Android phone?

[qoboty]

When I use nRF UART of android phone A and B to scan the bluetooth device, the scan result is below: first picture is the result of phone A, second is phone B:

first one:

second one:

why phone A cannot scan bluetooth device which address is CA:2A:C3:6A:C1:D8 ?

android phone A is: meizu note2 android phone B is: mi-4

note: five bluetooth device with name Littlehe-Demo-9-OTA is the nrf51822 run the example of ble_app_uart

[qoboty]

I use phone B, I can scan the bluetooth device that I expect, howerer, phone A can not scan out the bluetooth device the one labeled