Bugs in content types

Hi all,

Today I embedded H5P "fill in the blanks" in a page-resource and a lesson-resource in Moodle. After that, both the page and the lesson started to flicker on all my devices. The page and the lesson also contain other embedded H5P code (though in the lesson not on the same content page). The Moodle-activity "stealth mode" (activity invisible, but accessible) was activated at first, deactivated at the end, but the flickering continued.

It seems like a programming error. Does anyone know what to do?

My Moodle-version: 3.5.3

Hello Running Moodle 3.5. I've uploaded a less than 5MB video and only have 5 interactions. The activity is loading really slow and when i try to edit the interaction, i often get a 504-Gateway error. I know my comp can view mp4 files. Any advice?

I added images and hover text showing untitled image when there is no option to provide title to images.