Hi There!

I have a setup of 4x Deco BE85 (Main + 2 x wired + 1 x wireless) and experienced abnormal wifi upload speed on selective device, some of my device could reach normal wifi upload speed while some were limited to around 300Mbps.  All device were connected to same MLO SSID 

Internet Speed:

2Gbps D/L , 1Gbps U/L

Testing App/Web

Speedtest.net

Normal upload speed samples (probably obtained 500+Mbps):

iPhone 14 Pro, iPad Air (M2) 

Abnormal upload speed samples (Seems have a ceiling of 300Mbps):

Intel AX211 (this couldnt even connect to 6GHz), iPad Pro (M4)(6Ghz)

Anything I could try? Thank you!