DHCP Server is not able to assign ip address to mac and ios users. for now it's working fine for Android and windows. Iam running this router with the latest firmware. if I manually assign ip address

I have TL-R470+ and I have 2 internet connections (Fiber and 4G). I am following the below settings and still load balancing is not working. Always WAN1 usage is high Wan 1 Wan2