Bugs in content types

We are experiencing issues with the Drag and Drop exercise function. The problem is that correct results are shown in a purple colour.

We are experiencing issues with the Drag and Drop exercise function. The problem is that correct results are shown in a purple colour.

I have a problem with my course, all the videos could be uploaded correctly without problems and they were seen properly. But, for some time now, every time the page has a lot of traffic, the videos are demaged with "video format not supported"

What we do when this happens is delete the video and re-upload it and it immediately fixes itself. But we have to be there 24/7 for any eventuality, because users are having a bad experience.

The platform we use is Moodle and that the videos are uploaded in MP4 but converted to interactive videos.