You are assuming the mobile devices or PC"s those screen captures are from are accurately reporting. As indicated you may need to dig into the details to find out exactly how the devices are connected, to know for certain if it's 802.11ac or 802.11ax or something else.The picture clearly show the 6 in the top right of each band which indicates Wifi6, doesn't it?
Post the router's wireless log for starters so people can better gauge how things are connecting and what they're connecting at.
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