I’ve been using cloudflare for quite long (more than a few years) and just had a very strange problem.
I created two page rules (one for wp-admin) for WordPress, both with set to bypass cache. But when I checked the analytics, cloudflare was caching more than 80% of traffic although it shouldn’t cache and cf-cache was DYNAMIC.
I’ve configured cloudflare before changing ns record, so it should be impossible for cloudflare to cache contents of my page with the rules set.
I also enabled rocket loader on one of above rules, but it never worked even I waited for a few hours. Then I enabled rocket loader on Speed, and it just went smoothly without any problems.
My guess is that page rules for newly added domains may not be working for some reason. My other domains already on cloudflare work perfectly though…