Can't scroll down on a single page app

Hello I have been creating a single page app, with each block stacked vertically on each top of each other, They all have visible on page load unticked, and collapse this elements height when hidden ticked.

This all seems to work fine except for one thing: I can’t scroll down a page. If the block is longer than the screen size, I can’t scroll to the bottom of the page. The content is there still though, e.g. if it’s a form I can tab through the fields which takes me to the bottom of the page. I just can’t scroll.

Any ideas as to why this would be?

My bad. It turns out that I had added a new section, and this new section was overlapping with the placeholder at the bottom. With that fixed, it scrolls again!