When trying out my new Gotek drive, My Amiga did her own thing.
When the Selector.ADF was loaded, the selection bar keep on scrolling down.
Checking the joystick circuit, I noticed another resistance between pin2 of joystick port 2 than the other pins.
First I checked the Resistor pack RP401 but it seems ok.
Then I replaced U15, a 74LS157 (multiplexer) this fixed the problem.
My Amiga is now running again.