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Not sure how precise i can be tbh.

i am running 25.7.10 currently. I have rebooted the router several times since creating this post.
I did notice something , that the entry from neighbors was back in the arp table after flushing it (which is probably correct since i couldn't remove it)

What i do is:

I go to Interfaces > Neighbors. Select the entry i want to remove (check-marked) > click delete button > click yes to confirm > get the message near Apply "after changing settings, please remember to apply them" > so i click Apply.
The entry still remains in the Neighbors list.
I then rebooted the router (For good measure). After reboot, the static entry in Neighbors is still there (as well as in the Diagnostics > Arp Table).

This situation is not the end of the world of course. i can simply ignore the reserved IP address for now. But it is odd.

Some time ago i made a few static arp entries in the 'Interfaces > Neighbors'. Currently one of the entries has become obsolete and i wanted to remove it, but i am unable to do so.

I select the entry, click the delete button and apply. But the entry remains.

I've flushed my arp table and i don't see any leases referring to this device. Nor do i have any reservations in my DHCP services (not in KEA, ISC nor dnsmasq). I also checked my firewall rules but there is no reference to the device there either.
Previously i used ISC DHCP but i have switched to dnsmasq since about a year ago. And i think this neighbor entry is still from the time i used ISC DHCP.

am i doing something wrong or missing something obvious?