Hi @danielgc!
I inspected your page and found out that actually, you have the “checkbox” to subscribe to your SendFox list (added by our great plugin ?? ) on your checkout page.
The thing is – it is enabled, but hidden and unchecked.
Here’s how it looks when I “un-hide” it using Dev Tools.
https://share.getcloudapp.com/Qwu0kBjx
What you have to do here is:
1. Go to your WP admin > SendFox > Integrations > WooCommerce Checkout
2. Make sure you have “Implicit” option disabled.
P.S. Though if you want to have it checked already when page loads, use “Pre-checked” option there.
Cheers,
Bogdan