Take a look at the image below:
Here is the code causing issues:
<div class="excerpt">
<p>Manual for downloading and installing digital content from the Educational Canaima Project, comprised of learning resources that aim to promote interaction between[...]</p>
</div>
The text is mysteriously overlapping with the columns on the right. Despite adjusting the heights of all elements to 1000px, the issue persists!
UPDATE: Instead of a link, I have added an image as suggested by @Roddy of the Frozen Peas.
Some have suggested removing the & nbsp; removes the problem. However, since the admin inserts these characters, it was not possible for me to make changes. Thankfully, the accepted answer resolved the issue in the end.