After performing a clean, there are often tracking files left. Only on a few occasions they are all cleaned.
Even cleaning several times in a row doesn't solve the problem. This issue exits for a while in different versions of CCleaner, always expecting that this would be solved in the newest update.
Don't worry too much about it, and it isn't a bug to be fixed, it's the way a computer works. - I'll explain why.
These files are not 'tracking' you in any way.
What the CCleaner Easy Clean screen calls 'Trackers' is not what you or I (or anyone else) would normally consider as tracking files.
I ran a test and found that what the Easy Clean screen calls 'Trackers' are in fact simply cookies.
(Personal Comment - We think it's just an advertising 'trick' to make you