its working on my iPhone.
Can you connect the device to a different network and open the page in private/incognito browser. This will will eliminate any router, ISP and browser caches.
Some days ago I had the very same problem. My customer wanted a QR-code using an internal anchor link. Worked perfectly fine on desktop, but not on mobile. I don’t think it’s a GP issue. I had the feature turned off in the customizer and used scroll-behavior: smooth; in the stylesheet. This didn’t work either.
Besides, your site works fine on my Android 11 phone.