Why do the two expansion port indictors on the controller enclosure light up asynchronously?

Both expansion ports are powered by different power supplies; one is by the secondary power supply, and the other by the primary power supply.
During the system power-up, the secondary power supply powers up and then the primary power supply. Therefore, one indicator lights up and then the other.
During the system reset, the primary power supply is reset but not the secondary power supply. Therefore, one indicator is green on and the other is off.

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