Wifi Extender using connected device's IP instead of assigned static IP

I have 2 Router . Router 1 as Access Point (Wifi A) Router 2 as Wifi Extender (Wifi B) Router 1 is 192.168.1.1 Router 2 connected to Wifi A and assigned static IP 192.168.1.249 When I accessed both of them using browser, I can login on each user panel using assigned IP. User panel Router 1 not showing Router 2 assigned IP. Instead Router 1 are showing Router 2 using one of IP device that connected to Wifi B. it's causing IP conflict. I can fix the conflict by disconnecting device with same IP, but Router 1 showing that Router 2 using different IP again. How do i fix this? My router is Archer C

Question by Covid_Hobbyst on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.