Yes, that often happens. Handwriting changes slightly all the time because feelings at the moment of writing also change. When feelings change in a big way, that shows in handwriting in bigger changes. In the two M’s you sent, the second M has an added “temper tic” at the beginning, showing that your temper can get mad fast, and you added that temper tic at that moment. The second hump is taller, showing you sometimes feel “looked down on,” and you also added that at that moment. Knowing that about yourself can help you understand more about what makes you mad.