CNAME Flattening issue

I had to remove the CNAME record pointing to Cloudflare because I was having trouble with some HTML5 ads built with Google web Designer or Adobe Edge.

In particular the ad was visible to domain.com that had an A record pointing to the hosting server but not to www.domain.com with a CNAME record for www. pointing to Cloudflare.

Any idea why that was happening? In particular images were not displaying.
A.

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