Not sure if this is a bug with mairlist or Station Playlist Creator, but when importing a standard m3u playlist generated in SPC and saved as “mmmdd-hh.M3U” it doubles up some of the entries in the list. This seems to be happenning on the same positions in the list (as per attached image) everytime.
Can you please post a copy of the .m3u file that produced the output from the screenshot (if you still have it), or another m3u file with a new screenshot? Thanks.
Definitely an SPC issue. The songs already appear twice (and more) in the m3u file.
You can just open in it a text editor to confirm.
Check your export formatting options in SPC options (under advanced if I recall). You may have the same % tag twice. I made that mistake some years ago 