SB-3 Lowering Tempo and Syncing

Hey I just bought a DDJ-SB3 which appeared to have no damage. However when I connected it two major errors appeared. Any song put on the left deck will be slowed by 5.5%. This is regardless of tempo (same issue with 60 bpm and 130 bpm songs). If that same song is put on the right deck it will automatically sync to that lowered bpm. If a different song is played on the right deck it will appear that there is a normal bpm but sync is on. I have completely turned sync off on Serato and cannot explain the cause of either issue.