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1b1ed1a
(Get the code!)
This problem was first noticed in the Kindle for iOS app which uses the old MOBI part of the file.
In the original EPUB the file 003.xhtml starts with "<p class="saltoinicio asangre">Rwe jfbnmv qw ey Ydfjdh cxw xtytccn". The style for class "saltoinicio" in style.css is ".saltoinicio { margin-top:33%; }". So the intent is to have the paragraph start part of the way down the screen.
The corresponding old MOBI content produced by calibre is "<p height="150em" width="0pt" align="justify">Rwe jfbnmv qw ey Ydfjdh cxw xtytccn". The 33% value has been converted to 150em. This makes no sense to me. It implies that a screen width of 450em was used as the conversion factor.
This huge value causes the MOBI renderer to perform incorrectly in the Kindle for iOS app resulting in the initial text of that paragraph not being displayed.
When the same EPUB is run through kindlegen the old MOBI part of the result instead has "<p height="33%" width="0" align="justify">Rwe jfbnmv qw ey Ydfjdh cxw xtytccn". This renders much better when tested using the Kindle for iOS app and also on an old Kindle 2 device.