Bug in joomdle demo

Hello, I've been using the joomdle demo to get a better understanding of the available functionality this extension provides. If you go to the demo ( www.joomdle.com/jdemo/ ) and register for Digital Photography course, something strange happens. When you select a subject from the course overview, the page height matches the course overview page. This results is large swaths of unused white space. Is there a way to prevent this behaviour? Is it a known bug?

Some screenshots to illustrate:

Hi.

Demo is quite old, we need to update it.

You can try locally to see if you see the same problem: I just did in my locali nstallation and it is not doing that.

I can verify this behaviour did not repeat in my local environment.