Disappearing Text on Mobile Devices

I was experimenting with Arcane’s demo landing page in order to learn how some of the advanced (to me) features work. While the page looks good on the computer, text disappears while scrolling the page on a mobile device. I tried playing with amp settings to see if that was affecting it but can’t seem to fix the issue. Is this a known bug or am I missing something? Page in question can be viewed here.