I'm glad I found this thread, I'm having the same problem on Firefox as well. It appears that the 'All Dramas & Films' tab doesn't load all the sections at the same time. 'Currently watching' and 'Completed' load first, if you scroll down enough the 'Plan to watch' section loads, but then the 'Currently watching' and 'Completed' sections disappears. If you begin scolling up again they reappear, but then 'Plan to watch' secion disappears. It makes scrolling difficult as the length of the page keeps changing when sections disappear/reappear and causes the scrollbar to jump up and down
Disabling javascript fixes the issue, but that of course isn't a practical solution as it breaks all functionality of the site. I hope this information can help.