Why Is my Popup Appearing Behind My Header or Other Element?

There are 2 possible causes:

  1. Your z-index on your themes menu is a bit higher than normal.
    • You can adjust the popups z-index of your popup at the bottom of the Display Settings section.
    • Adding a few 0s to the end of each generally fixes it.
  2. Your theme is likely including wp_footer(); inside a div with z-index value other than auto.
    • Set the z-index of that div to auto.
      • For ex.  #page { z-index: auto!important; }
    • Move wp_footer(); outside of that container