Might want to shut down inssider (and/or even update it...), 'forget' the network, re-associate and check inssider again.
Of course, after verifying once again (a reboot wouldn't hurt either - both laptop and router) in the web gui everything is correct.
If it's still showing the same: this would be reason enough for me to try the latest beta v.2239 from Asus or RMerlin's excellent 374.38_2-em firmwares.