As far as i can tell, it depends where your thumb is when you scroll up/down.

If you scroll down with your thumb on the short description, it scrolls the content of the text within its box down one line, then scrolls the list of articles. That’s the cutoff you’re seeing.

If you scroll up with your thumb on the short description, it scrolls the content of the text within its box up one line, then scrolls the list of articles.

Something about bubbling events maybe?

This is super dope, what a fantastic idea and good execution. Well done!