rekordbox 4.3.0 BPM

Hi, I currently use Serato DJ. A few month ago I got a license for rekordbox and I like some of the features like creating playlists and not having to use creates in Serato. My controller is compatible with rekordbox. Just this past weekend I update to 4.3.0 which is the latest version. I added my songs to the library and scanned the tracks so it would not have to think when I load a song for the BPM. The problem I noticed was that now when I load and play a song, ex. I have a 128 BPM EDM song when I am playing the song my BPM change from like 127.8 to about 128.3 something like that when look at the track in my playlist is shows as 128. Why would my BPM change like that when I play the song. I have a intro Pioneer DDJ-SB2 controller it's not like I am using DVS and turntables. Any ideas? I am thinking it's a setting in rekordbox