Hello, @buscape,
Your issue is resolved now, please check back to your site after clearing the browser cache.
First, I have Turn On Enable classic widget panel from XStore > Theme Settings > General/Layout then I have delete custom HTML widget in cart area from Appearance > Widget. See image here: https://ibb.co/ysM8GCB and https://ibb.co/LQrTfCB
Regards 8Themes Team.