2 x 5kw Inverters In Parallel - Only The Master is Exporting to The Grid. Why?

The day was continuously sunny but during periods 3, 5 and 7 it looks like solar production was considerably less than during periods 4, 6 and 8.
It looks like the slave inverter is not being used to export to the grid


During periods 3, 5 and 7 the system mode was set to
Selling first
Use Timer
Max Sell Power 5500
Priority Load
Grid Trickle 0
The time period settings were
Grid charge time period not selected
Power 5,500
SOC 10
During periods 4 and 6 the system mode was set to
Selling first
Use Timer
Max Sell Power 5500
Priority Load
Grid Trickle 0
The time period settings were
Grid charge time period selected
Power 5,500
SOC 100
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Thanks very much for your help and sorry to be such a numpty but I'm not sure exactly what system settings you'd like to see (I did include as many as I though relevant in my original post). What is the Settings/System1 console screen?