siunitx not aligning ranges in table perfectly

I have the problem, that the S type column ist not aligning at the interval sign perfectly. See this MWE:

documentclass[final, 12pt, USenglish, a4paper]{scrbook}

% UNITS
usepackage{siunitx}    %for properly using SI units
sisetup{range-phrase={hspace{0.08em}--hspace{0.08em}}, range-units=single}

% TABLES
usepackage{booktabs}   % formatting table lines: toprule, midrule, bottomrule
%usepackage{multirow}  % span table cells across multiple cells
usepackage{caption}    % formatting captions
captionsetup[table]{singlelinecheck=false, justification=justified}    % aligning table captions on the left
usepackage[flushleft]{threeparttable}  % aligning tablecaptions and notes. wrap tabulars with it: begin or end{threeparttable}

begin{document}
begin{table}[ht]
    centering
    begin{threeparttable}
        caption{Some MWE:}
        label{tab:mwe}
        begin{tabular*}{0.8textwidth}{l|@{extracolsep{fill}}S}
            toprule
            One column              & {Strengthtnote{1} / si{kilojoulepermole}}        midrule
            aaa                     & numrange{40}{360}                                    
            bbb                     & numrange{40}{200}                                    
            ccc                     & numrange{4}{50}                                      
            ddd                     & numrange{40}{120}                                    
            eee                     & numrange{4}{80}                                      
            fff                     & numrange{0}{50}                                      
            ggg                     & numrange{0}{20}                                       
            xxx                     & numrange{4}{40}                                       midrule 
            iii                     & numrange{160}{480}                                   
            jjj                     & numrange{80}{320}                                     bottomrule
        end{tabular*}
        begin{tablenotes}
            footnotesize
            item[1] Bla
        end{tablenotes}
    end{threeparttable}
end{table}
end{document}

The – sign is aligned perfectly everywhere BUT row iii, where the interval suddenly apparently aligns the 160 centrally above the 80. Does anybody know how to fix this? I don’t really know where to start.