Chartjs-Why the bar are not aligned the y axis

Ok, I guess, I localised the problem
by commenting those line

/*,
time: {
  unit: 'day',
  unitStepSize: 1,
  displayFormats: {
    'day': 'DD MMM YY'
  }
}  
*/ 

I have to better investigate but I correct this part of code with works really better

time: {
  unit: 'hour',
  stepSize: 1,
  displayFormats: {
    'hour': 'ha'
  }
}