Glitch - section disappears behind full width/height section

My site has a slider section with 100% width and 100 vh set to sticky. When I scroll, the section below glitches by temporarily disappearing behind the slider. This was previously occurring in Safari on desktop, but since I added the 100% width to the section wrapper, it does not happen in Safari on desktop. However, it still occurs in Safari on iPhone. Does anyone have any tips? Do I need to set a max height or something like that?

Here is a video showing the glitch:

Thank you

Here is my site Read-Only: LINK
(how to share your site Read-Only link)