Users cannot download any digital download beyond first

Hi,

I have a few files available for download for buyers of this digital product. A few users reported that they cannot download any file but the first irrespective of which option they choose.

I use Cloudflare + WP-Rocket. I have already replicated the behaviour even after disabling CF. This seems to be a recent problem.

Perhaps, I missed some setting. Any help would be highly appreciated.

Thanks!

The page I need help with: [log in to see the link]