CartFlows with Mailchimp on Checkout

I’ve had Cartflows installed for some time but only today realised that the ‘Join our Mailing List’ checkbox on the Checkout page has not been returning its results to Mailchimp as the default Checkout page was doing without issue.

I can see in the MC4WP plugin that the Checkout Integration is correctly enabled (I have a variation on the standard ‘Join our Mailing List’ text so I know it’s coming from here), but it seems that Cartflows is overwriting it with its own text option, and not, as I say, forwarding the email addresses etc on to MailChimp.

For now I’ve had to turn off CartFlows while I search for a solution. On another thread someone suggests that this is just an issue when the administration is logged in, or using Firefox, etc, but this is not the case, or not completely.

I could send you screenshots of the ‘with CartFlows enable’ and ‘without CartFlows enabled’ but I don’t see a way to do so here.

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