I find this rather odd and don't see a reason for it. Device is RT-AX86U. Sample Log with bolded variations:
Jan 10 10:08:03 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.222 48:8f:5a:c3:fc:ac
Jan 10 10:08:03 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.222 48:8f:5a:c3:fc:ac MikroTik-CRS305
Jan 10 10:08:32 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.66 f0:27:2d:a0:70:96
Jan 10 10:08:32 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.66 f0:27:2d:a0:70:96
Jan 10 10:09:15 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.40 c8:ff:28:7c:2b:92
Jan 10 10:09:15 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.40 c8:ff:28:7c:2b:92
Jan 10 10:38:06 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.3 b4:f7:a1:b3:80:68
Jan 10 10:38:06 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.3 b4:f7:a1:b3:80:68 android-9782aa618bd2546c
Jan 10 10:56:35 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.31 ac:67:84:f1:45:50
Jan 10 10:56:35 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.31 ac:67:84:f1:45:50
Jan 10 16:01:51 kernel: eth4 (Ext switch port: 3) (Logical Port: 11) (phyId: b) Link DOWN.
Jan 10 16:01:51 kernel: br0: port 1(eth4) entered disabled state
Jan 10 16:01:51 kernel: br1: port 2(eth4.501) entered disabled state
Jan 10 16:01:51 kernel: br2: port 2(eth4.502) entered disabled state
Jan 10 11:06:53 wlceventd: wlceventd_proc_event(469): wl0.2: Deauth_ind 04:036:75:85:28, status: 0, reason: Unspecified reason (1)
Jan 10 11:06:53 wlceventd: wlceventd_proc_event(505): wl0.2: Auth 04:036:75:85:28, status: Successful (0)
Jan 10 11:06:53 wlceventd: wlceventd_proc_event(534): wl0.2: Assoc 04:036:75:85:28, status: Successful (0)
Jan 10 11:06:53 hostapd: wl0.2: STA 04:03:d6:75:85:28 IEEE 802.11: associated
Jan 10 11:06:53 hostapd: wl0.2: STA 04:03:d6:75:85:28 RADIUS: starting accounting session 72A78D818A849710
Jan 10 11:06:53 hostapd: wl0.2: STA 04:03:d6:75:85:28 WPA: pairwise key handshake completed (RSN)
Jan 10 11:06:53 dnsmasq-dhcp[2992]: DHCPDISCOVER(br0) 04:03:d6:75:85:28
Jan 10 11:06:53 dnsmasq-dhcp[2992]: DHCPOFFER(br0) 192.168.2.77 04:03:d6:75:85:28
Jan 10 11:06:56 dnsmasq-dhcp[2992]: DHCPDISCOVER(br0) 04:03:d6:75:85:28
Jan 10 11:06:56 dnsmasq-dhcp[2992]: DHCPOFFER(br0) 192.168.2.77 04:03:d6:75:85:28
Jan 10 11:06:56 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.77 04:03:d6:75:85:28
Jan 10 11:06:56 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.77 04:03:d6:75:85:28
Jan 10 16:07:05 kernel: wl0: random key value: 7581E8126DB795573C5C00CB1ED479FE652D7542991900D88F4B56BA823FE777
Jan 10 11:07:05 hostapd: wl0.2: STA 04:03:d6:75:85:28 IEEE 802.11: disassociated
Jan 10 11:07:05 wlceventd: wlceventd_proc_event(486): wl0.2: Disassoc 04:036:75:85:28, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8)
Jan 10 11:07:05 hostapd: wl0.2: STA 04:03:d6:75:85:28 IEEE 802.11: disassociated
Jan 10 10:08:03 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.222 48:8f:5a:c3:fc:ac
Jan 10 10:08:03 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.222 48:8f:5a:c3:fc:ac MikroTik-CRS305
Jan 10 10:08:32 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.66 f0:27:2d:a0:70:96
Jan 10 10:08:32 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.66 f0:27:2d:a0:70:96
Jan 10 10:09:15 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.40 c8:ff:28:7c:2b:92
Jan 10 10:09:15 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.40 c8:ff:28:7c:2b:92
Jan 10 10:38:06 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.3 b4:f7:a1:b3:80:68
Jan 10 10:38:06 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.3 b4:f7:a1:b3:80:68 android-9782aa618bd2546c
Jan 10 10:56:35 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.31 ac:67:84:f1:45:50
Jan 10 10:56:35 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.31 ac:67:84:f1:45:50
Jan 10 16:01:51 kernel: eth4 (Ext switch port: 3) (Logical Port: 11) (phyId: b) Link DOWN.
Jan 10 16:01:51 kernel: br0: port 1(eth4) entered disabled state
Jan 10 16:01:51 kernel: br1: port 2(eth4.501) entered disabled state
Jan 10 16:01:51 kernel: br2: port 2(eth4.502) entered disabled state
Jan 10 11:06:53 wlceventd: wlceventd_proc_event(469): wl0.2: Deauth_ind 04:036:75:85:28, status: 0, reason: Unspecified reason (1)
Jan 10 11:06:53 wlceventd: wlceventd_proc_event(505): wl0.2: Auth 04:036:75:85:28, status: Successful (0)
Jan 10 11:06:53 wlceventd: wlceventd_proc_event(534): wl0.2: Assoc 04:036:75:85:28, status: Successful (0)
Jan 10 11:06:53 hostapd: wl0.2: STA 04:03:d6:75:85:28 IEEE 802.11: associated
Jan 10 11:06:53 hostapd: wl0.2: STA 04:03:d6:75:85:28 RADIUS: starting accounting session 72A78D818A849710
Jan 10 11:06:53 hostapd: wl0.2: STA 04:03:d6:75:85:28 WPA: pairwise key handshake completed (RSN)
Jan 10 11:06:53 dnsmasq-dhcp[2992]: DHCPDISCOVER(br0) 04:03:d6:75:85:28
Jan 10 11:06:53 dnsmasq-dhcp[2992]: DHCPOFFER(br0) 192.168.2.77 04:03:d6:75:85:28
Jan 10 11:06:56 dnsmasq-dhcp[2992]: DHCPDISCOVER(br0) 04:03:d6:75:85:28
Jan 10 11:06:56 dnsmasq-dhcp[2992]: DHCPOFFER(br0) 192.168.2.77 04:03:d6:75:85:28
Jan 10 11:06:56 dnsmasq-dhcp[2992]: DHCPREQUEST(br0) 192.168.2.77 04:03:d6:75:85:28
Jan 10 11:06:56 dnsmasq-dhcp[2992]: DHCPACK(br0) 192.168.2.77 04:03:d6:75:85:28
Jan 10 16:07:05 kernel: wl0: random key value: 7581E8126DB795573C5C00CB1ED479FE652D7542991900D88F4B56BA823FE777
Jan 10 11:07:05 hostapd: wl0.2: STA 04:03:d6:75:85:28 IEEE 802.11: disassociated
Jan 10 11:07:05 wlceventd: wlceventd_proc_event(486): wl0.2: Disassoc 04:036:75:85:28, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8)
Jan 10 11:07:05 hostapd: wl0.2: STA 04:03:d6:75:85:28 IEEE 802.11: disassociated