I was only able to select the first one, but the issues I described seem to occur most of the time.
Since the newest update though, I simply walk through the doors and fall off into empty space when trying to enter the training room (before hitting Generate Volunteer) or the room across the hall lol
Once inside the training room, it seems like the buttons for generate new male and female volunteers are backwards. Clicking “Generate new female volunteer” gives me one with “balls” and “penis” stats lol Whenever I try to use one of volunteers generated in that way, I always end up with the broken sliders and meters.