As long as you have it in Calibre, why not "convert" it to epub with the "jetBook 5-inch"
output profile set. You can do a "conversion" even if it already is a .epub file. It should
reexamine the page/chapter structure and make any adjustments needed, most likely
fixing the problem.
As to why you are seeing the problem in the first place, I have no idea.
Luck;
Ken
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