Hi ateterine,
this because of your time range modifiers you did use, the @h as latest will snap to 03:00pm in your case not 04:00pm. If you want to snap to the current hour you should use this +h@h instead.
This can be tested in the UI time range picker, in the Advanced section also the docs have some good examples about Specify time modifiers in your search.
Also, you should check the chart graph formatting how it will display 0 or no results; as gap, as zero or connect
hope this helps ...
cheers, MuS
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