Unfortunately their IP hasn't changed between connects, and no user has been banned...
Yes the changes should be auto-updated, but thats whats strange since it happened today to another user who had a new IP I added the new IP but the user had to wait around 5-6 minutes before they could connect successfully.
I did a site config rehash but might have to try that site rehash instead
Haven't tested to restart the server, but I have to wait and see if I stumble upon another IP change if that might fix the problem
Cheers!