Shapes moving out of alignment in preview mode

Thanks for your assistance.

My DPI is already set at 96 and the file is local until after it's been published and loaded onto the LMS.  I've copied the slide and attached it here.  The shape over the character shifts when previewed.  The idea is that as the learner progresses and learns more about the person, more of the character is exposed so that they see more than just the disease.  It doesn't work so well when the object on top shifts and exposes the character.  The red 'lights' on the gauge shift when the slide is previewed as well.  I haven't tried publishing yet to see if it's just an issue with the preview function.  Regardless, it's hard to work on it if I can't preview it and see it as it will appear.  I eagerly await your suggestions.