Hello @MZodiaco 

If you can manually turn on/off the plug, and the plug respond to the APP control (as you can hear the click sound), it could be some glitch on the plug.

You could try to reboot the plug by unplugging and plugging it back

Try factory resetting the smart plug and reinstall it in the kasa app. 

Try a different home appliance like a different lamp and see if that makes any difference.