Maybe it is just that firmware, maybe the list only shows dynamically allocated IPs in the DHCP range? The stock firmware on my Asus RT-AC86U shows static IPs as well. Once in a blue moon the GUI stops showing clients all together in that screen though, a reboot brings them back up.
Do you see the IPs in other screens, like QoS target clients for bandwidth limit, for example? Have you tried rebooting it?
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