Checkbox for Agree Terms not visible in Checkout form

On the Checkout page when customer agrees to terms the checkbox does not show any check mark or anything that could indicate to the customer that he has indeed clicked on the "I agree to terms". I mean - the button works but for the user/customer it's not that clear that the checkbox has been selected.

Edit: I figured out this happens if you copy the checkout link directly from the paywall in community. If I copy "direct checkout" link from the product in the FluentCart it works fine.