I really don’t understand how this work:
For the I have a Security account (SA) with 2 google shares bought in january 2020 and a deposit account (DA) with only fees regularly taken (from 0 to -150).
On the following graphs, I plot only the SA (pink) and SA+ DA
To me it looks like that in the performance chart the green line is below the pink line. And the green line you said is with fees.
If you refer to the two peaks on the right side, this may be due to display resolution, rounding, etc. Did you zoom in with a different reporting period? Did you analyze the absolute values?