Maybe because you used the different editors: visual editor at the first page http://prntscr.com/pefsg1 and text editor for the second page http://prntscr.com/peft3x
If you use the visual editor and add the “Enter” on the first page you’ll get the No-Break Space https://prnt.sc/peftq3 that adds the additional space. Once you open the text to edit it again text editor, unfortunately, removes empty paragraphs and No-Break Spaces and you lose your space again, it’s not depends on our theme this is how the editor works. That’s why we would recommend you to use margin-bottom style to add the additional space below the text.
