Problem with heos changing his location (IP remains)

There is one reciver with 4 channels and 2 recivers with 1 channel.

The problem is with the IP addresses. In heos app, I can make the IP address static. But I don’t know how its possible, but the zones are switching places.

First when I configured the IP addresses, then for example I connected to the kitchen reciver with IP address 192.168.1.24. Some days later, If I send play command to this IP address, the sauna reciver starts to play.

Is there a way to fix this problem?