Logic Pro X / Export Midi File /

Hello,

In Logic Pro X I have written a bass line with a midi keyboard using the fingered bass sound that comes with Logic.

I have then Exported the bass line converting it to a MIDI file..

However, when I drag the MIDI file into GarageBand (Mac) it converts into numerous tracks each playing a few notes of my original bass line?

What am I doing wrong and how do I fix this?

Thank you for your help.