Although I am an American, I am 66 years old and am not a schoolboy. In fact, about half of the learners here of traditional school age are not boys. Perhaps it is Google Translate’s fault for using the gender excusionary word “schoolboy”, though.

Anyway, I have had this same issue and really should have reported it. I find that it occurs if I ever choose the option to view a video within a course/subject. Once I choose this option, only the videos that showed up the first time I used this feature within a subject/course show up for the rest of that subject/course.

I suggest that you use Report a Problem, found in the top right part of this Help Community screen. If it is too much to type in again, refer to this post to describe the issue.

I will also try to remember to report this issue the next time I get it. And I apologize for not reporting it earlier, although I have to say that most of what I have reported gets acknowledged and told that it is now something they will try to fix, but they sometimes don’t fix it. So even if I had reported it before, it could have still been an issue.