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The page is coded as a table with a cell entry or table row being too large.
The square with the arrows is supposed to allow you to move around within the table. Tap once on the screen to get the square to appear. Then tap on the square to activate. You're supposed to be able to navigate the table at this point, but I'm not sure how this works on a Touch screen. The old Kindles had a cursor that you could use for this.
If it doesn't happen too often, you can see more of the text by temporarily reducing the font size. Change back to your regular size afterwards.
The table will extend close to the edge of the screen (whatever the Kindle's default margin is), so to turn the page (for a Touch screen) tap within a cm or so from the side.
To eliminate the problem altogether, you need to change the code.
Calibre has a "Linearize tables" option in the conversion's Look & Feel section (Layout tab). This will change all tables within the book.
Ebooks will use tables when some special formatting is required, as with poetry, plays or some nonfiction works. If you use "Linearize tables" then all the tables will be affected. To selectively change the tables you would have to recode in the Editor.
Space between lines is "line-height". You set it in the CSS. Use the Editor for this. You can set it in Calibre's "Extra CSS" field (Conversion's Look & Feel section - Styling tab), but I think this will affect line-height for everything. To do this selectively, use the Editor. Default is usually "line-height: 1.2"
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