Reading device usage graph

I can’t figure out how to read the usage graph for one of my devices. It’s a pump and I have the graph set for Today. It shows activity at every hour. I ran the lawn sprinkler from 1:00-2:00 pm, and the graph shows 0.7 kWh at 1 pm and 0.1 kWh at 2 pm. Basically the pump was turning on and off for that hour so I expected the 2 pm reading to be higher. There needs to be a little help link on that page to tell you what the graph is depicting and how to read it. Also, its showing 0 time on and 0 times on too, so what gives with this page?