DAX for Pareto Chart

[jar2019]

Pareto Under Review Chart = 
    VAR TotalOverDueDocs = CALCULATE(DISTINCTCOUNT('Del PMI PLP'[Document Number]),ALLSELECTED('Del PMI PLP'))
    VAR CurrentOverDueDocs = DISTINCTCOUNT('Del PMI PLP'[Document Number])
    Var SummarizeTable=
    SUMMARIZE(
        ALLSELECTED('Del PMI PLP'),
        'Del PMI PLP'[Discipline],
        "Docs", DISTINCTCOUNT('Del PMI PLP'[Document Number])
    )
    var CumulativeSum= 
    SUMX(
        FILTER(SummarizeTable, [Docs] >= CurrentOverDueDocs),
        [docs]
    )
    return
    DIVIDE(CumulativeSum,TotalOverDueDocs)

The DAX above is what I am using to build the Pareto combo chart shown below. However, as you can tell from the picture if the column value is the same the line does not show a cumulative and the cumulative value becomes static. I think the error is in the SUMX function but I can not figure this one out. Even when the column value is the same it should still add to the cumulative total. Your help is appreciated. 

[TeigeGao]

Hi @jar2019 ,

Could you please share the pbix file to us for analysis? Besides, please share more information about your "the column value is the same the line does not show a cumulative and the cumulative value becomes static", do you mean that the value not changed when you are using slicer?

Best Regards,

Teige