INA219 bug or feature

Hi guys,

today I’m experimenting with a couble of INA219 devices, simular Adafruit INA219.

On the divice itself it is possible to set 4 addresses (0x40, 0x41, 0x44, 0x45).
0x44 & 0x45 are also used by SHT31, I guess this is why page sensor addressing only mentioned 0x40 & 0x41.

But why are 4 channels available on mqtt (voltage, voltage_ch1, voltage_ch2, voltage_ch3 [same for current]).
Which channel is representing what address?
Why are voltage and voltage_ch3 both having different values, while only one INA219 is used on addess 0x40?

Sorry, but its a litle bit confusing.