Upon further investigation, this looks like another potential PHP issue with the template.
If you inspect the element on the Joomla Article page you'll see the <div class="sp-module-content-bottom clearfix"> shows up outside of the <div class="article-body-wrap"> as shown in this screenshot.

I'm having a similar issue with the <aside id="sp-right"> on the Newsberg template as seen in this forum post: https://www.joomshaper.com/forum/question/293
On both of these sites, the Catgeory Blog pages display the elements correctly, it's only an issue on the Joomla Article pages.
Kind regards,
John