extraneous MIDI file data

I am importing some midi files I created in Sibelius into note~. At the beginning of the file there is some data (I assume header data) that note~ is interpreting as pitch data. The problem is that I don't to know how to access the data to delete. Starting playback of the files at a point after that data is not an option since I syncing these files up with a live performer. I opened the file in Logic but I do not see this data in the piano roll. Any thoughts on how to get passed this?