If a visitor submits a form and there is an error the form will reload the page or post and return to the top. The visitor would then be required to scroll down the page or post to see if any errors were generated. Many times, they do not do this and incorrectly assume that the form was submitted successfully.
If your “Terms of Service / Terms and Conditions” page contains an Enfold Advanced Layout Editor “Color Section” element this will cause an undesired display of said page when a visitor clicks on the “Terms and Conditions” link from the WooCommerce Checkout page.
The solution; don’t use the Advanced Layout Editor’s “Color Section” element on your “terms” page.