That is the expected behaviour. Users assigned to the Course Creator role cannot modify courses by virtue of being assigned to that role. The CC role allows users to create new course son the site (plus a few other things - look at the role in Users > Permissions > Define roles > Course Creator).
When someone who is assigned to the CC role creates a course they are assigned to that course in the Teacher role. It is the Teacher role that provides the course editing permissions.
Provided the user is only assigned to a course (as opposed to a category or system) as teacher they do not have editing access to other courses.
Security and privacy
Course editing by a non-creator
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