I'm having the same issue with a couple of songs. Both were originally Logic 9 files, later opened and saved in Logic Pro X. However, I have other files that were also imported from Logic 9 that don't have this problem.
Basically, I'm trying to record a solo, and about half of the time, when I try to scroll to the section where I want to record/play, it jumps back to the beginning of the song. That is, the VIEW jumps back, not the playhead. If I press play, it will play from wherever the playhead is, but as soon as I press stop or pause, the view jumps back to the beginning again.
-ME