I guess the default editor on your site strips out HTML tags in this custom HTML module so it doesn't show as expected.
You can go to Global Configuration in backend of your site >>set the Default Editor option to None:
then edit this custom module and use this content:
<div id="top_text_effect" data-sr="move 16px scale up 20%, over 0.7s" style="visibility:hidden;">
<img src="/images/DianaHandwrittenClay.png" alt="" class="top_text_signature" />
<span class="top_text_sub1">
Hallo! Mijn naam is<br />Diana van Raamsdonk
</span>
<span class="top_text_sub2">
Transformatie- en ont-wikkelcoach
</span>
<a href="/index.php/contact" class="readon">Laat me je coachen</a>
</div>
Hope this helps.