Header expanding on Store page now

We've noticed that the space above the header expands on our store page for some reason. It wasn't doing this a while back, but suddenly started doing it fairly recently. With working on all the cart issues, we simply didn't address it until we got the function fixed.

I was also told that the store isn't working on Safari. I don't have it, so can't check.

Can someone take a look please - support enabled.