minor sync issues

When attempting to sync certain songs to a higher BPM instead of syncing along with the master track their BPM is lowerd which i had originally thought could be the range of the tempo fader even though it is set to 75% (100% for some reason is no longer an option). But when i load the same song on both decks and manually move the BPM up on the master track to my desired speed no matter how low the BPM may have originally been the second track syncs perfectly. i would like to know how i can fix this issue.