Hello,
Thank you for reaching out to us with your concern.
Upon review, we have observed that you are utilizing a Content Delivery Network (CDN) as evidenced by the following screenshot: https://prnt.sc/pTzMZpDdFnUa. We kindly request that you clear both the CDN cache and your server cache. Once this has been completed, please proceed to verify the header.
Should you require any further assistance or have additional questions, please do not hesitate to reach out.
Best Regards,
8Theme’s Team