Horizontal scrolling on mobile website issue

Hi there,

My client's website is acting strange on his phone (iPhone 13 Pro - version iOS 17.0.2) when using Safari.
On the homepage, instead of scrolling down, it scrolls to the side to a white background. I cannot find what the problem is since I do not see this bug from my phone (iPhone SE - version iOS 15.5) and neither does my partner who has a more recent iPhone. 

Any idea what the problem could be? 

TIA

Can you share the website URL, is this just happening on one page?

Sorry! Here it is: https://kombuchainc.com/

And yes, only on the homepage. 

I can't replicate the exact issue, it loads with a bunch of white space and a horizontal scroll but that very quickly disappears. Do you have any code injection or coded elements on the homepage? 

Thank you for getting back to me! 

Here is the only code for the homepage: 

/* Display navigation titles on both sides of the logo */

.header-nav-item.header-nav-item--collection:nth-child(1) {
    position: absolute;
left : 20vw;
  z-index: 2;
}
.header-nav-item.header-nav-item--collection:nth-child(2) {
    position: absolute;
left : 30vw;
z-index: 2;
}

.header-nav-item.header-nav-item--collection:nth-child(3) {
    position: absolute;
    right: 30vw;
  z-index: 2;
}

.header-nav-item.header-nav-item--collection:nth-child(4) {
    position: absolute;
    right: 20vw;
  z-index: 2;
}
  .header-nav-item.header-nav-item--collection:nth-child(5) {
    position: absolute;
    right: 10vw;
    z-index: 2;
}