It seems like it’s only this collection page as well, right at the bottom there is a load of white space, but i cannot see what is causing this when inspecting element?
The white space is coming from the .featured-collection__container sections. If these are customized sections, the developer should be able to get them fixed.
I am unsure why that is happening, it would require a more thorough analysis to pinpoint what is going on, however it should give you a solid starting point in terms of debugging.