Weird look of electricity usage graphs - question

Hi, i've recently added battery Luna 2000 5kWh to my photovoltaic setup (SUN2000-6KTL-M1 as inverter + backupbox B1 + smart meter DTSU-666H 3F) and since then i get weird looking graphs under electricity usage:


before installing battery i had:

Can anyone answer me what is wrong :slight_smile: - maybe i screw something up in connections (smart meter?) or in HA?