Bugs in content types

Hi friends,

could you help me with this issue:

When someone put to his site generated code of h5p content from my Drupal 8 site, after every clearing drupal cache(for examp. "drush cr" command) on clients side(where embed code is inserted) instead the content appears:
"The website encountered an unexpected error. Please try again later." - message.

Do you have any idea why I'd get an "invalid security token" (cf. screenshot) when trying to load an .mp3 into the Course Presentation tool?

Hello!

We are creating content using the Quiz (Question Set). We noticed that (all of a sudden) the ‘tip’ icons started appearing in the questions while we did not put in any text.

When I look at the DOM structure, I can see that a <br> has been added. Has anyone seen this before and/or is there a solution to get rid of the ‘tip’ icons?

Thanks and best,

Bas