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stlink-v3pwr, Energy measurement STMCubeMonitor-Power v1.2.1, Bug?

Associate II

Attached is a saved power measurement. When i zoom into an area with nearly constant current (e.g. from 17,851s to 17,867 s, see picture attached) the tool states an average current of about 1500µA and about 6µJ of energy. When i recalculate the energy of this time frame manually i get about 88µJ of energy.

I'm not sure if i made the measurement at 3,3V or 3,6V, but this does not matter, since the deviation is too obvious.

Where is the fault?