Schneider XW+ 6848 sell to grid confusion

rescool

I have two schneider XW+ 6848 inverters, and have sell to grid enabled on both. However, the numbers on the attached screenshot don't add up, i.e., sell to grid + load is about 1.5kW more than solar production. I know for sure the load number of 2.7kW is wrong because I turned off most of the appliances in the house, and the correct number is less than 800W, then the numbers will add up.

1. Why the load number is wrong
2. If I still want to sell to grid, should I do it on both inverters, or just one of them?