They only exist once in the itunes xml file.
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My Rekordbox music comes all from iTunes import.
Last week I mentioned that there is more music in Rekordbox then in iTunes, after that i found songs that are once in iTunes and in Rekordbox twice, both of the entries in Rekorbox point to the same file.
How do I resolve this problem?
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They only exist once in the itunes xml file.
Do you possibly have iTunes set to manage your files? Open iTunes, look in the Preferences under Advanced for this:

Let me know if that is checked.
It isn't checked,
I can remember I unchecked in when I was using recordbox for the first time.
Seems like I have 300 times a double reference to one file,
The recordbox location have some uppercase letter differences.
Is there an easy way to resolve it?