JustJ Hi mate, it’s been discussed a lot before elsewhere on the internet - it’s a limitation to do with the screen and the CPU which is from a 2016 CDJ-2000nxs2. Don’t worry about the bars - use them as a sort of guide if you must - but get into the habit of moving your eyes away from them and listening to the beats to hear if they really are aligned and making really small nudges on the CDJ Jogwheel because the screen is sometimes wrong anyway whether you use Pioneer analysis, Traktor, or Denon Engine.
Sometimes this being seen as a problem is caused by people not turning on MASTER CUE (top right) and the CUE (on the top of the channel fader of the track you are bringing in), along with then using the CUE/MASTER headphone knob.
i.e. I often find turning to around 9 or 10 o cock and maybe around 2 or 3 o clock gives me a much more accurate feeling in my ears as to whether a track is really ‘in’ or not. One track does not overpower the other and trick my ears - this exposes the difference as one goes quieter.
The BPM counter and beat grid is not going to be accurate all the time - so it is best to start developing this habit to step your mixing skills up.
I have to be honest, learning on CDJs instead of vinyl did me no favours with this topic and it took me a long time to start doing it properly.