BPM issues on Rekordbox DJ

Hi all, i recently downloaded the Rekordbox DJ 30 day trial and i honestly love it. But...i had bpm issues on a few tracks after all my songs were analyzed. For example ill play a song in my playlist that shows 120 bpm but on the deck i have it playing on ..shows 156bpm , i know this is the trial but is there a fix to this? i really like the software but i dont wana regret buying it if theres issues like that occuring while im playing a set