Problems with accumulating in stacked column chart

AmandaSoborg

In this scenario, your "running" measure is based on current date to specify the "up to date" range. So when going to 2018, there's no fact data, then your running total supposes to keep same value all the way to the end. 

If you want to keep it in one year, you need to apply filter on month number like: 

=
CALCULATE (
    [measure],
    FILTER ( ALLSELECTED ( Table ), DimDate[MonthNum] <= MAX ( DimDate[MonthNum] ) )
)

If you want to calculate the running total within each year, you should use TOTALYTD() function. 

Regards,