[SOLVED] CDJ 900 BPMs does not show on the display

Question about this BPM display.....  When I use a regular CD or an USB stick to play music on my CDJ-900s, the BPM display display the BPMs of the track.  However, when I use a control CD and Serato, the display does not show the BPM, the BMP box (to the right of the track bar graph) is empty.  Is this normal behavior?