Panel Y-axis loses it's scale after selecting a wider time range

I’m trying to plot API hit count with Graphite data source. It’s a counter stat increasing with every API hit.
Everything is fine until I select a time range up to last 24 hours:

But when the time range rises, for example to the last 2 days, the plot scales down the values on the Y-axis, as you can see here:

I’m using the summarize function with a 1 hour interval.
How can I fix the graph so the scale doesn’t break when selecting a wider time range?