I have the same problem. My issues occurred when I recently upgraded to GivTCP V3 having had the dashboard working fine with previous version of GivTCP. Tried various different settings but can find nothing that works.
This is normally caused by the reset to 0, but after midnight.
In your second graph the last battery discharge value from the 17th is about 9 kWh and in the energy dashboard is seems to match that value. You can try this Energy Dashboard shows odd entry on graph after midnight - #5 by karwosts or using an utility meter for every sensor with “Periodically resetting” enabled