Here it seems the first bucket have values centered at 0, on hovering the mouse over the bucket the value of the bucket is shown as zero. It would have made easier to follow it if I could show the bounds of the bucket. Is it possible?
Scale Y-Axis to Data Bounds
The default Y axis bounds are zero and the maximum value returned in the data. Check this box to change both upper and lower bounds to match the values returned in the data. --- Have you tried this option?
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