Website lags only on iPhone

Hi! I hope you’re well

I’m designing a website for a client that looks well on desktop, tablet, landscape and portraits.

But in portrait it lags from iPhone 11 to iPhone 13, here’s the video of what happens: WhatsApp Video 2022-08-14 at 10.02.58 AM.mp4 - Google Drive

I’ve tried to see this same issue in my iPhone SE and in 2 Android phones, and it doesn’t show this problem, so I don’t know what could be happening. I’ve had similar issues with this for another page, see here: Site looking different in the mac pro and chrome

Here’s my read-only link:

I hope you can help me, please