FastOwlSim's SimGIC scoring discrepancy

SimGIC score calculated using FastOwlSim doesn't match among output files written in FORMATTED and CSV formats. However, SimGIC calculated using SimpleOwlSim matches with that calculated using FastOwlSim in output format FORMATTED.

Input owl file: simont.owl
Properties file: properties.txt
General command used: owltools simont.owl --fsim-basic -p properties.txt -o out.txt

1. Using fsim-basic and output format as CSV: out-fsim-basic_csv.txt
2. Using fsim-basic and output format as FORMATTED: out-fsim-basic_formatted.txt
3. Using sim-basic and output format as CSV: out-sim-basic_csv.txt

In both above csv files, I assume values in the last column as SimGIC scores (column titles don't align with those values, or else column title was missing).

Why do scores differ depending on file format? Besides presumed code refactoring, is there any difference between scoring methodology used in FastOwlSim and SimpleOwlSim?

Start by running the reported owltools simont.owl --fsim-basic -p properties.txt -o out.txt command with the linked simont.owl and properties.txt inputs. Compare the CSV and FORMATTED outputs, including their column headings and final values, with the provided reference files; done means the output formats agree on SimGIC scores and any remaining FastOwlSim/SimpleOwlSim difference is explained or corrected.