Hello Pro!
I have another ticket open for this website but this is a different issue that just occurred this morning after updating wordpress core. (Not sure whether that is the problems)
This problem is isolated to one page - one section and only in safari funnily enough! Works a charm in Chrome still.
I tried using some CSS to override the current z-index but the z-index is fine and working as normal. When inspecting the element in safari there are no problems.
The section in question is labelled “Bottle Background” half way down the homepage.