Site jumps on check

Hi,
I have small problem on my site. I'm using Moodle 3.6.4 and Joomla 3.9.8 and the Joomdle version is 1.2.4. When a user has entered an answer in a quiz and klick on check to verify if they have the right answer the site "jumps" and the text disappears. The user has to scroll down to be able to see the text. You can see this in action on the video below. Any ideas how to fix this problem?

www.dropbox.com/s/1tet4hy8hl7ohw8/20190408_210123.mp4?dl=0

Hi.

Does this happens only on mobile or also in desktop?
You can also try a different Moodle template, to see if problem happens too.

Thanks for your reply! It happens in desktop as well but it's bother the users very much. It's mostly on iPad/iPhone and Chromebook that the users complain. The situation disappears when I use Clean as a theme but I would like to use Joomdle Bootstrap. I'll contact the developer of the template to see if they have a solution to this problem.

Yes, I think that's a good idea. If it works fine with a different template, maybe some change in Joomdle Bootstrap could make the jumps go away.