ARP poisoning problem

I’m using ROS 3.28

My hotspot clients seem do not have arp-reply from hotspot gateway.

Here the case:
One of my client (Computer A) using static IP 192.168.1.1
Other client (Computer B) that eventually using static IP with the 192.168.1.1 as gateway, have mac-address of Computer A instead of hotspot interface mac-address. If Computer B using gateway other IP other than existing one on the network, it works fine (because it have hotspot mac-address in the arp table)

Seems that mikrotik’s arp poisoning to client not powerful enough.
Any idea to solve this problem?

Regards,
Brian

Let me simplified this.

Hotspot should be reply any arp-request from client computers with hotspot mac-address.
What happen if the real owner of IP address replying also (in case the IP address is used by a computer on the same subnet)?