Question about TP-Link Archer MR600 4G+ Dual Band Gigabit Router

Address Reservation is not working for me for MACs on the 3rd page (>16 records). Could you please check this with your router and confirm/decline? I have added many MAC/IP reservations and up to 2 pages (8 records per page) everything worked fine. Then I added the 17th (first on the 3rd page), and only once I got this IP. Every other time I get random IPs from the DHCP range. MR600 V1 Firmware Version:1.2.0 0.9.1. Thank you for your help!