ADE7858A is debugged under Linux. According to page 28 of the ADE7858A Data Sheet, the programmable gain is 1, 2, 4, 8, 16. The gain is set to 4 for the cigain register, but it is read as 0, which does not match the manual description

ADE78xx xWATTOS Register

ADE78xx datasheet describing WTHR[47:0]