I want to export tracks from one user account to another on my Mac but the GPX file comes out all diiferent with additionat lines and distances what am I doing wrong?

Hello 

I recently completed a trip using a friends In Reach Mini 2 and I want to import the tracks into my own Explore account but this is proving to be very difficult. I upload the tracks to my computer and then when I try to download them to my Explore account they appear very different than the originals, there are 3 files instead of one and many extra lines. what am I doing wrong? 

edit The app freezes up mopst of the time as well