Energy Dash Board Grid import

Hi, I can see this has been asked in a few posts but no answers so thought I would try again. I use Telsa powerwall for my data and I find that the grid import is always wrong, Using Home Site Import we almost never import from the grid (bar the usual 100 W/H it uses to talk to the grid) the tesla app shows no import but im always getting 2 or 3 KWH usage anyone able to shed some light on this

TIA