Sticky cards overlapping issues on iOS

Hi everybody,
I’m having trouble with sticky elements that should overlap on iOS (Mobile and Tablet) but are kinda bugged.
The elements in question are the cards in the CMS collection after the About Section.
On desktop, I don’t have this trouble because is a horizontal scrolling section, and on Android, everything goes well. So the problem is still in iOS (both Safari and Chrome).

Here is my site Read-Only:
And here is my site in a subdomain:

Ciao Filippo, piacere, looks great on iOS, is still bugging?

Ciao Bimbi, piacere mio! This is the video of what append on my iPad (Pro 11”) and the same thing happens on my iPhone (7).

Video here: