after pppoe my lan port 2 and 4 run on 10mbps half duplex but if i put to lan 1 and 3 its going back to 1000mbps full duplex anyone have a solution thank you

guys i have question about down bandwidth speed. i use ax 73 as main router than connect to ax 10 as satellite router with ethernet backhaul use cat6 cable, if i near main router the speed is normal l