Not getting even close to full wifi speeds (w/ Gigabyte x870e Eagle Wifi 7 motherboard)

At multiple different houses with different ISP's, I am getting less than 50 MBPS out of 500 MBPS. I have the antenna connected in the back. However, if I use a secondary router as an access point to rebroadcast the signal, I can get full speeds. I notice in network settings that it says it's using wifi 4 protocol on the slow wifi, which I think is the problem.

I have read other reports of weak wifi signal with Gigabyte's other boards too -- hopefully it is not a hardware problem and could be fixed with a driver update. Anyone have any idea how to fix this or do we need Gigabyte to address it themselves?