Course creators are listed as Participants, but they are certainly not being "enrolled" (you're enrolled when you're "taking" the course). Notice the menu at the top center of the Participants page? What does it say? If its says "All" or "Course creators" then naturally you're going to see them listed. If you don't want to see them listed, choose some other role, like "Students" or "Teachers".
You may want to check out the hidden assignment feature. I haven't used it, but it seems to address this issue.
Roles and permissions
Course creators are enrolled in every course
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