Weird looking text on mobi (converted from epub)

[Pablear]

Hello! I hope I'm posting in the right forum.

I'm helping a friend to create an ebook which will eventually be published. We already created an epub (using indesing and calibre e-book editor), and I converted the book to .mobi using KindlePreviewer. Although the output file looks good on the KindlePreviewer, I checked it in a Kindle Paperwhite, and I get some weird looking text (example in attached image) on some paragraphs which have a certain style. I've been trying to find out what is the cause but I can't seem to find one.

The encoding for every file is encoding='utf-8'.

I'll paste the xhtml and css for the text in the picture in order to help

p.titulo_3blanco {
  -epub-hyphens: none;
  -webkit-hyphens: none;
  color: #1d1d1b;
  font-family: "Roboto Condensed", sans-serif;
  font-size: 1.083em;
  font-style: normal;
  font-variant: normal;
  font-weight: normal;
  line-height: 1.2;
  margin-bottom: 23px;
  margin-left: 0;
  margin-right: 0;
  margin-top: 28px;
  orphans: 1;
  page-break-after: avoid;
  page-break-before: auto;
  text-align: left;
  text-decoration: none;
  text-indent: 0;
  widows: 1;
}

<p class="Titulo1grande---indice"><a href="epub_breviario-10.xhtml#uEZvBBaBuGbEt9Xc34VIH7A">Los Diseños “Nacionales”</a></p>
			<p class="Titulo2---indice" xml:lang="en-GB"><a href="epub_breviario-10.xhtml#uky2JaBVxFCLXcwsUdR9Ku7">17. Alemania</a></p>
			<p class="titulo_3blanco---indice" xml:lang="en-GB"><a href="epub_breviario-10.xhtml#unKeC7Ijr9hDhSFeFp8T4gD">ULM</a></p>
			<p class="titulo_3blanco---indice" xml:lang="en-GB"><a href="epub_breviario-10.xhtml#uNSDUWpq4Ulfspi4FK83TTF">El Nuevo Diseño Alemán (NDA)</a></p>
			<p class="titulo_3blanco---indice" xml:lang="en-GB"><a href="epub_breviario-10.xhtml#uBY8ZOVXxmyM9ovSlaEAX8F">Acerca de la Identidad alemana en Diseño</a></p>

I hope you can help me too resolve this issue in order to avoid it in the future (since I create ebooks for work).

(The xhtml and css is messy because it was created by my friend, who doesn't know how to edit it.)

Thanks for reading!

[digital.ebook]

Can you please share the CSS for "titulo_3blanco---indice" attribute. Else you can email the ePub file at "digital.ebook.solution@gmail.com" so that I can debug it.

Thanks!

[dgatwood]

You might try stripping out the xml:lang="en-GB" bits and see if that fixes it. I vaguely recall xml:lang being problematic on Kindle, but I could be remembering wrong.