Q: On every track change the sound becomes overloaded (too loud) and then becomes normal normal, is it a bug?

No, it is not a bug. Most probably you misused the Preamp DSP. You can fix it as following:

  1. Make sure that in Controls screen you have Preamp slider in the middle position (0 dB).
  2. Settings -> Automatic Gain Protection -> check if RESET GAIN value is 0 dB, if not then reset it to 0 dB with the slider.