Ulwaysultra

Sunsynk/ Deye has a strong recommendation in their user manual not to extend the CT clamp's cable  beyond 15m. This is because the transformation ratio of the CT is 100A/50mA, which means 2000:1. For domestic consumption, typically in the tens of amps, the induced current in the CT is small enough for the additional length of the  cable to add significant enough resistance to influence the current by the time the inverter measures it at the other end. You need to consult your installer about rectifying the problem.

When you are drawing from grid must be positive. 
Your always draw goes negative so CT wrong. You can just swop the 2 wires around in the inverter and check.