Hi,

I searched the forum, but I didn't find my case about Address reservation.

The same thing happened with the earlier version, but I didn't post on the community.

Reproduction steps

Case 1

0. routers configutation webpage

1. the client receives an IP address, it is in the list "Network\LAN\DHCP Client List"

2. click on the floppy disk icon in "Operation" column to reserve the IP

3. caption says Permanent -> OK

4. switch to "Address Reservation" tab and find the previously reserved ip

5. edit it to another address

6. make the client ask for the IP again - i.e. restart the router and switch off and on client

7a. the router will assign the same address as before dynamically without taking it from the address list

or 

7b. if you have previously added an entry to "Address reservation", the router will assign a new IP and after pressing Reserve, it will add a second entry with the same mac address

Comment: I suspect that the router is incorrectly checking the entries in this "Address reservation" list