Private WordPress pages made public with Cloudflare enabled

I’m using Cloudflare with a WordPress website and I noticed that private WordPress pages/posts are sometimes available to the non-logged users when Cloudflare is enabled. These private posts are also listed in the archive pages for non-logged users.

The private pages disappear from the non-logged users if we disable Cloudflare with the “Development Mode” option.

We have in place page rules to cache all our content except the admin area:*
Cache Level: Bypass Enabled*preview=true*
Cache Level: Bypass Enabled*
Cache Level: Cache Everything, Edge Cache TTL: a month

Our website uses only two plugin. The Cloudflare plugin and the WP Super Cache plugin.

I don’t understand why this happens.

Thank you for your support.

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