Issue in Simplest Measurement in Energy Dashboard

Dear all,

I just installed a power meter using SML and ESPhome. No solar power or something, just a plain power network consumption. After some trials with different devices I got it working, but the initial measurement in the energy dashboard makes no sense.

This is the value read from the meter (I took a longer period from December 24 to ensure I got all data from all tests):

This is what the Energy Dashboard interprets for today:

I am a bit confused how to correct that. Is it maybe correlated with old data from former ESPhome devices I also tried at beginning of January? Can I simply reset the dashboard and delete historical sensor data?

Would you please help me? Thanks.