It says after every weave, champ, legend or ranked: max amount acquired, 400 essence when the map is done.
After failing the map, a reward of 2,2 K is shown.
This doesn’t happen only to me but for other players as well.
Even one who picked up the game today and played his first weave was awarded 400 essence.
I’ve just had a game telling me ‘max essence acquired’ as well, when I’ve only got about 220k saved. Friends of mine have much, much more than that… ._.