In doing a little more trial and error on this I found the problem was in the way the file was being converted to .html, or the way the .html was being converted to .mobi. A blank line was being added to the beginning of every paragraph (which in this case was a picture) and in the case of Kindle hardware readers displayed as a blank page between pictures. Anyway, there is an easy fix. It's in this thread-
https://www.mobileread.com/forums/sho...d.php?t=149291
-for anyone who wants to read it. Long story short, from kovidgoyal's message, just enter-
p, div { margin: 0pt; padding: 0pt }
-in the 'extra css' text box of the conversion settings. This eliminates the line which turns into a blank page in a series of pictures.