Difference in data values between GivTCP and web portal

I am currently importing inverter data into Home Assistant via GivTCP. I am using the Energy Today variables to plot energy consumption. For example GivTCP PV Energy Today kWh for solar. However, when I compare this value to the same parameter on the web portal energy graph, across several days, there are significant differences, as much as 20-30% in some cases.

Has anybody else seen this?

Bluebeef just checked mine out for yesterday.

GE portal shows 8.38kWh PV generation, home use 6.02kWh, export 1.54kWh
HA shows 8.6kWh PV generation, home use 6.9kWh, export 1.6kWh

The only thing they agree on is battery charge, even the battery discharge differs (2.84kWh GE vs 0.8kWh HA)