BPM problem between rekordbox and XDJ 700

hi, i changed from a dj controller with serato to pioneer 4 channel mixer an xdj 700 because i wanted to have a standalone system. i like it very mutch and i use rekordbox to select the track an than load it to the xdj. but i have some tracks which are analyzed by rekordbox with 150 bpm and when i load them to the xdj it shows 75 bpm. what happens there? and how can this be solved? mixing the track with this error is not possible.