Course presentation not showing properly on Moodle

I have difficulty getting H5P course presentations appear correctly on a Moodle platform. Just created a two-slide presentations that looks ok in edit mode, but when I publish it to Moodle, it's a mess (see attached pictures): only the first slide is there, the second one is missing, the layout is not what I wanted, some of my text is missing and there is text that I didn't enter (advice on how to navigate from one slide to the next). I've redone the presentation several times over, nothing seems to help. Your help and advice is greatly appreacited!

  1. Platform and version number: Moodle 3.5.11
  2. Desktop
  3. Browser: Firefox and Safari (MacBook Pro, MacOsCatalina 10.15.5)
  4. H5P plugin version: 1.20.2
  5. H5P content type and version (if a content type was used), and a sample URL or attached H5P.: attached
  6. Any browser console errors
  7. Any PHP errors
  8. Screenshots if it's a visual problem: attached
  9. Any recent changes to the environment (new plugins/modules, updates, configuration changes etc.): Moodle was updated 4 months ago, MacOs this week (auto update)
  10. Any recent changes to the browser you're using (new extensions, updates etc.): none