PV charger Watts

My standalone system has two series of panels (total 2kWp), 30 kWh lead batteries, all managed by Vic’s system.
Question: my two blue solar MPPT show 379 and 358 Watts but the total shown is 428 instead of 737W. Why?
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Calculations are not made in real time!
The totals are displayed with a time delay.
Especially with rapidly fluctuating yields, the displays in the VRM may deviate.
First of all, it is important that the totals in the Remote Console match.