[Roy Dennis]

I have just been testing this and it is possible to have a kma file and a kmh file of the same track in the same folder and both import and play as normal, meaning duplicate entry.

Normally when you select to import as kma an extra save to window appears at the top right for you to select a folder to save these types in, I attach pic showing extra Save to window.
This does not appear when you import as kmh types as the kmh header has to remain in the same folder as the original file.

If you saved your original kma files to the same folder as their original mp3+g file this could possibly lead to accidently creating a duplicat of the file. It shouldn't happen under normal conditions because the folder containing the mp3+g files creates an importedFiles.txt file so stops a file being imported again but if you select to not hide indexed tracks in the import hard drive files dialog then it can as I just tried it.

So if you definitely have the kma in the same folder as the mp3+g files I should try and separate them to their own folder.
If you want to know a way of doing that let me know.
As I stated before this is not the case with kmh which must remain with the original file.

Another little tip, if you ever do a rebuild database unless you are trying to add new songs at the same time always make sure none of the "Song Types to Index" buttons are highlighted as if it finds any of the highlighted types in the rebuild it will import those as well which could be another way you may have inadvertently imported the duplicates.