CloudFlare Caching

I set up my whole site (including CS-Cart) in CloudFlare. My client posted a link to the store on Facebook, and my store is getting overrun with traffic. I thought CloudFlare should be helping, but the store is sending the following headers to prevent caching:

Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache

Does anyone why the store is doing this and how to stop it?