Mobil application connects to a device I don't want.

[cemalb]

Hi,

We use an application developed by us while establishing the nRF52 connection with the mobile device. When I chose an nRF52 device to establish a connection, I realized that there was a process of connecting with both the nRF52 I chose and another nRF52 in the environment. Then I also tested with the nRF connect application. I observed the same situation with the nrf connect application.

As follows;

I'm choosing a device to connect. but sometimes it connects to both. what is the reason of this ? how can this situation be prevented?

but it connects to both:

  

[cemalb]

this situation leads to:
For example, there are two separate devices containing nRF52 in the same environment. One is mine and the other is my friend's. When I connect to my device with the mobile application, I also connect to my friend's device at the same time. my friend's device is stopping advertising. For this reason, my friend cannot see his own device when entering the mobile application.
how can this situation be prevented?