It's not your shutter speed that affects depth of field, it's aperture. The camera adjusted aperture to compensate for fast shutter, lighting conditions and long lens which resulted in the photos you got. Now if you had your camera set for aperture priority, to adjust aperture to get better depth of field, the camera would adjust shutter speed accordingly.
Nice camera, but lots of settings to learn.
Thanks for the info. Yes, I have a lot to learn about this camera. It’s a fairly “simple” camera compared with others, but to me it’s plenty complex. Good thing the camera knows more than I do about taking photos. :-)