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In the HTML sitemap at the voice glossary where you can find some level (Glossary, name of glossay, the name of glossary, the letter and the word related at the letter where you can find the descriptions):

Glossary;
|_ name of glossary; (ex: "glossary of animals")
|_letter of alphabet; (ex: "A")
|_word related at the letter. (ex. "animal")

At all levels except the last, insert the correct links to the glossary, the last link (word related at the letter) but link to a blank page.

To make you understand, paste the exact link that should bring the site map:
/index.php?option=com_glossary&id=1

Instead the link to which port is the following:
/index.php?option=com_glossary&task=entry&id=1&Itemid=70

which leads to a blank page.