Hi,
Thank you for contacting us reagrding your concerns.
Based on the headers you shared, this issue can occur because your origin server (Cloudflare-nginx) is sending cache-control headers that prevent caching. Sometimes, sites with sensitive information intentionally disable caching for security reasons.
To help improve caching on your site, please consider the following:
Please try these steps and contact us if you need further assistance.
Best regards,
Priya.
Cloudflare Customer Support Team.