Today does not show the full day in the graph

Data source: Postgres
Grafana version: 6.5.2

Running into an interesting problem where filtering for Today (UTC) in the time range correctly filters the data but does not show up in the graph.
The below screenshot shows the graph filtered for today:

It only starts at 6, which would be local time +6 for me.
But same query, same filter, except table visual:

This shows all the data.
Then when I just manually filter for today (1/16/2020), everything comes back:

Any ideas as to what’s happening?