Negative DC power is the battery being charged, positive DC power is power being used. The values and arrows are correct. Do you have a shunt measuring your DC system or do you just have the “Has DC system” enabled.
If you have a DC system shunt it is installed backwards.
If you do not have the DC system shunt then the DC is a calc using all other data and any errors in any of the information end up in the DC box. There is a good explanation in this FAQ. You only need a 2% error in one of your current readings to give 200W eror in the DC tile.