Offizieller Kommentar
This can happen on occasion if there is a conflict between the audio file and the entry in the collection; the unique file identifier code was incorrect, re-used, or another anomaly occurred that somehow made it so the wrong file was exported.
If it happens again, please file an inquiry ticket here and our rekordbox support team can gather some additional information to see if it's an issue that will be reoccurring and if we can prevent it in future. Thanks!