Network Error: ARP proxy required?

Hi,
I’ve upgraded my deco mesh system and started a new network. I am having issues transferring files and after 1 3/4 hour remote session the guy diagnosed the following:
“e4:5f:01:fe:43:32 is the MAC of the home assistant (192.168.68.136), and 192.168.68.59 is the IP of this computer. The acceleration entry of X50-PoE thinks that 192.168.68.59 corresponds to e4:5f:01:fe:43:32, which causes the problem”

He asked “Is it possible for this device to perform ARP proxy? From the current analysis, X50-PoE maps the MAC of 192.168.68.59 to e4:5f:01:fe:43:32, causing the problem.”

I have no idea what an acceleration entry or ARP poxy is is our how to fix.
For testing I’ve turned off home assistant and file transfers are working as they should.

Any help appreciated.