Problem with auto iso on x-pro2

I am not sure whether there is something I did wrong but I have a problem with the auto is with my x-pro2.

I selected auto iso min 200, max 3200 and min 1/60ss.

Using a 18-55 lens. When I select manual aperture on the lens the auto iso works perfect when changing teh aperture. But when I select auto aperture on the lens and change the aperture with the front wheel the shutterspeed goes below the 1/60s and the iso stays the same at 200.

Does anybody knows what goes wrong?