Ok, thank you. I indeed would say that these rides were low intensity rides.
But these short power peaks during the acceleration (on a traffic light for example) can’t be (only) a measurement problem. Since one need indeed more power to accelerate, of course. So a few seconds in a high power zone during accerlation must be real. The question is actually if such short power peaks compromise the low intensity training or can they just be neglected if they are just a few seconds each time.