ROG Rapture GT-AXE16000 and RP-AX58 Problem

[soundeluxe]

Hello. I have a question, and I would appreciate your help. I have a ROG Rapture GT-AXE16000 Router with the penultimate version of Merlin installed. I also have an RP-AX58 model extender with the latest software. I connected them to each other via the AI Mesh system, and the location and signal look good. I can get internet to my other rooms, but even though I have a 1Gbps internet connection, I'm only getting 100-150 Mbps speeds through the RP-AX58. I've tried resetting it and everything else, but the speed just won't increase. I also don't have a suitable place to connect the router and extender with a cable. Before this, my TP-Link RE705x range extender was delivering 250-350 Mbps speeds. How can I resolve this issue?

Btw, sorry for my bed English.