Graph Panel Bar Chart Bar Width doesn't span across whole interval

I am using a stacked bar chart graph which is grouped by date histogram with timestamp. The interval is set to one day, but the bars don’t span across the whole day. They only span across 14 hours. I would like to span the bar across the whole day.

How can I do this?
Thank you!

The min doc count is set to 0, no trimmed edges.


What are your time range of the dashboard? Could you provide a screenshot which underlines your problem?