Underlaying markup appears to being corrupted

Problem/Motivation

While the module seems to be working OK, we have noticed some odd behaviour in terms of the underlaying markup be a bit mashed!

For example, without the module active...

With the module active and apparently working OK elsewhere

When that happens, the underlaying markup is...

<p><span role="button" tabindex="0" class="glos-term" data-gterm="20715" data-once="glossaryListener">computer
    science</span>dem<span role="button" tabindex="0" class="glos-term" data-gterm="20643"
    data-once="glossaryListener">and</span> f<span role="button" tabindex="0" class="glos-term" data-gterm="20644"
    data-once="glossaryListener">or</span> <span role="button" tabindex="0" class="glos-term" data-gterm="23074"
    data-once="glossaryListener">computer</span> science professionals.</p>

Whereas without the module, the same paragraph would have been...

<p>There is a huge demand for computer science professionals.</p>