I have selected a custom inverter and it isn't showing the right number of strings. How do I fix this?

On each inverter, you can see:

1. The number of inputs (MPPTs) 
2. The number of strings on each MPPT: 

If the number of inputs is incorrect, you need to add more trackers in the Solar section of your custom inverter. The number of inputs will correspond to the number of trackers in this section.

If the number of strings is incorrect, you either need to adjust the number of allowed strings or check the current value in the Solar section of your custom inverter.