Note the file "portada.xhtml", in this case it is a cover and the tag is <h1> (but this is the same for a cover, a chapter, etc.).
Observe the text carefully within the svg.
In the file "Estilo.css" you will find that the h1 tag (in your epub should be h2) has the property: display-none.
In short the header tag does not actually look, it's for the TOC. What you see is the text that is in the svg wrapper.
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