The router is not able to correctly monitor the Real-time Rate here as well as in the Tether app. Most of the time is just showing below 0~1KB UP/DOWN even when my devices are downloading or uploading.

I've tried with QoS Enabled and Disabled also the same.

Tried reset router also the same.

Another issue I found out is that the System Log cannot be cleared. Always getting "Operation Failed" when I clicked on "Clear All"