All Global Ditty settings are set to default now. I’ve set up a blank template with a general content area for the Ditty above and below the header using the Ditty shortcode. The error occurs without the header below and when there is only one Ditty block as well as when there is only the header with one Ditty shortcode block below. Two Ditty blocks in any position fixes the error, but one can still see that the line height isn’t correct until after the first tick completes.