Why is the picture not loading on the phone?

Question

Images

Here is the code
When I scroll through the projects, on the computer all the pictures are loaded as they should, and if you scroll from a mobile device, then if you watch the site using browserSync, on the computer all the pictures are loaded and on the phone some are loaded and some are not.
Here the video
The video showed that on the project "planet of childhood" the picture is no longer loaded on the phone, but on the computer it is loaded ...
I don’t even know where to start debugging, tell me the vector please