Could you use the history function to plot your total energy spent today sensor together with your sensor.bw_shp6_e55c_current_power and present that here?
That looks indeed a little bit off. Could you do the same but “zoom in” so only the first power usage is visible (for more details) - like choosing the time from around 07:00 to 09:00 more or less?
And one thing you might wanna try already to see if it makes a difference is to set the method of your integration (riemann sum integral) sensor to left