KWh is a measure of total energy, not instantaneous power. Your watt meter was saying that since last reset of the value it measured 40 KWh of energy use. That's not an insignificant amount - a Chevy Bolt can go around 180 miles on 40KWh.
Watts, or kilowatts, are instantaneous power. That same Bolt can easily pull 100KW while accelerating and if it could somehow do that for an hour, it would have used 100KWh. It could never make it the whole hour as it has a 65KWh battery, so it would run out after 39 minutes.