adding extra space below

Hi there,

Just installed the plugin and I like the how is displaying the posts. When first installed slider looked fine, but while clicking on the posts to add them to the slider noticed that adds an extra space below and grows with more post showing in the slider. I have it in the template at https://cert.workbooth.info/ but same thing happens when added to a page as https://cert.workbooth.info/prepare-your-system/

Is there a way to prevent this, or is there a conflict with the template?
Any help is appreciated

Thank you
Alek

The page I need help with: [log in to see the link]