Phantom white space at bottom of page?

That’s what I discovered as well after sequentially deleting elements from the page. In my case, additional space was caused by a hidden reusable element in a floating group.

So far I’ve been able to create a new group focus without apparent problems, but not so with the reusable element.

I’ve seen on other threads that sometimes unexpected white space can be caused by overlapping elements, but I’m using the responsive engine and everything is stacked with appropriate spacing

Any idea why this would suddenly become a problem?