Unexpected rendered HTML for title

[c.buhtz]

Hello,

I have this title line in my org file:

    #+title: test_latex_fragments

Using org-html-export-to-html produce this:

    <h1 class="title">test<sub>latex</sub><sub>fragments</sub></h1>


I assume there is a good reason why Org does it that way. But I want to
understand.

Why does this happen?

Kind
Christian Buhtz