On all of my pages, there are several “40 px” or “70 px” showing where there are blank spaces vertically.
I have inspected the elements, and they are “span”.
This happened after updating plugins, but also installing AMP by Automattic.
I have since deactivated AMP, but the problem remains.
Sorry to hear of the problem you are having.
Could you please check whether you are facing the same issue as reported in the following topic and use the solution shared in it?