Are you sure those conversion figures are correct?
The left figure increases in a 1 then 6 progression and the right figure alternates between 217 and 224. That doesn't seem right for converting an ADC reading to anything meaningful.
Yes, it is correct. I am reverse engineering a stabilizer for a client. The stabilizer has 4 Relays and lower cut off value is 110V and upper cut off value is 280V. The relays provide a output voltage of 203 to 253V for 111V to 279V input. The client needs the device to work as original product. The original product output voltage varies like that. Client mentioned that a fake output voltage of 217V to 224V has to be displayed as in the above table.