CCleaner is showing cookies that are not in the firefox folder and are not found by other program. Confirm I am correct CCleaner looks in C:\Users\THISPC\AppData\Roaming\Mozilla\FireFox\Profiles\j0aauzsv.default
It does look for Firefox cookies in your Firefox profile folder.
However those aren't the only types of cookies and sometimes CCleaner has been known to state there's cookies but they're impossible for an end-user to find.
Cookies can also be set by Adobe Flash Player using an LSO ("Flash cookie"). To clean Adobe Flash Player cookies make sure you enable the cleaner for Adobe Flash Player in CCleaner.
Then there's also Supercookie, Zombie cookie, and Evercookie.