Issue with Calculations When Selecting Multiple Items on Page-Level Filter

Hey, I’m running into an issue where some calculations aren’t working properly when I select multiple items on the page-level filter [df_ProjectSummary[Project Rev Rec Type]]. Does anyone know what might be causing this?

RunningSumMnth = 
VAR minimumdate =
    CALCULATE (
        MIN ( AppendCombinedRunningSumMnth[Date] ),
        ALL ( AppendCombinedRunningSumMnth[Date] )
    )
VAR totalhour =
    CALCULATE (
        CALCULATE (
            SUM ( AppendCombinedRunningSumMnth[Hours] ),
            CROSSFILTER ( AppendCombinedRunningSumMnth[Project Name], df_ProjectSummaryRunningSum[Project Name], NONE ),
            AppendCombinedRunningSumMnth[Region_Adj]
                = SELECTEDVALUE ( df_ProjectSummaryRunningSum[Region Adj] )
        ),
        FILTER (
            ALL ( AppendCombinedRunningSumMnth[Date].[Date] ),
            AppendCombinedRunningSumMnth[Date].[Date] >= MIN ( AppendCombinedRunningSumMnth[Date] )
        )
    )
RETURN
    IF (
        MIN ( AppendCombinedRunningSumMnth[Date].[Date] ) <= minimumdate,
        SUM ( df_ProjectSummaryRunningSum [Remaining Billable Hours] ) - totalhour
    )

Page filter selected only 1 item

When Selecting multiple items 

It should sum up both values, but it's not doing that. Any idea why is that? All I want is for it to sum up the values for whatever items are selected in the filter. (For example, the Ratable number for December is 2,324.75, and the % Complete number is 2,875.25. When I select both, it should sum up to around 5,200)

Thank you