Wallacei fitness value and flatten

When using the Wallacei plugin to calculate the Standard Effective Temperature (SET) and Useful Daylight Illuminance (UDI 100-2000) in architecture, I set absolute values in the process, but the SET fitness value turned out to be negative. Is the fitness value the result?
In this link,

someone mentioned flattening the data, but even after flattening the data for UDI, the results are still strange numbers.
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This issue does not have anything to do with Wallacei. it depends on your calculations, you are subtracting your calculated values from two numbers, if the calculated values fall below those numbers, your fitness values will turn negative