It looks like the search bar in Interfaces → Neighbors → Automatic Discovery does a partial match. Searching for 192.168.1.1 also shows 192.168.1.1xx. Is there any way to force an exact match search?
Should be worth raising a ticket over. Not sure if we can find a good solution that fits all, but I remember the live log had similar issues before so that's why it has search filters there.
Cheers,
Franco