Issue [Solved] Lessons does not open [Wordpress, Learnpress]

Hi!

We have a wordpress page on our NAS and we have LearnPRress site. If i am starting a lesson it is working like this:  https://imgur.com/a/3uhFlpb

We have the same LearnPress site in our website. If i am starting a lesson it is not workint, not load like this:  https://imgur.com/a/XPSpSL8

The LearnPress interface does not load as it does in the first picture.

Sometimes the lessons only loads and never happening.

Do you have any souliton for this problem?

Unfortunately, the website is in a internal network which is works with VPN.

Thanks for your help,

Bence