Controller setup issue. Alternates between

[Nx9]

Hi All,
I am new to using Dolphin. I have the following controller and connector,
Beinhome Wired Gamecube Controller
https://www.amazon.co.uk/gp/product/B07N2H9WBP/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1

Connector
https://www.amazon.co.uk/gp/product/B07DR97WVJ/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

I installed the secret keys software for mojave
https://secretkeys.io/gcadapterdriver/

When I connect up the adapter and controller and go to the controller settings in Dolphin.
Port 1 is set as Gamecube adapter for Wii U. When I click on configure it says adapter detected and rumble is selected.

When I run a rom however the controller does not seem to work and when I go back to check controller settings it now says adapter not detected while emulation is running.

I am new to using Dolphin, any thoughts recommendations for how I can get the controller working will be appreciated.

Thanks.