It has to move during calibration if that's the question.
If you think it does something really crazy, please post a video about it on YouTube and provide us the link using the media link button, that will help everybody.
Oups, I see now what you mean. In my case, I was so happy it pass finally the horizontal calibration that I was not taking care of anything apart what the Assistant said about the vertical calibration
As @Thunderdrones said, the gimbal will go crazy when the MP is put vertically, so forget about what the gimbal does.
If you are really concerned about that, you can put your screen flat on floor so the MP stay in its normal position but it sounds complicated and it will waste your time.