What is the metric "Top Metrics"


I use Grafana v9.5.5 (284c43c23d) on Windows.

I try to make a dashboard for a license tracking.

For that I use the panel Time series and the metrics “Top Metrics” for display the max numbers of license and the licence used.

But, when I use the order Bottom of Top Metrics, some data miss. But not when I use Top order.

Top order:

the query:

Bottom order:

I want to understand why with Bottom orders some data miss and not with Top order.

Sorry for my english and thanks for you help.