Convert bar chart to pivot table

[koguma]

Appreciate any help.

Below is a bar chart. The height of the bar shows the sum of 4 members type. The x-axis is the month from now till 2020, based on this field "expiration_date_gmt".

The expression I used to generate this chart is 

=Count(TOTAL expiration_date_gmt) - RangeSum(Above(Count(expiration_date_gmt), 1, RowNo()))

I want to represent this bar chart as a pivot table or table, and instead of showing the sum of 4 members type over month, I want to show individual members type over month. 

I used back the same expression and I realise that the figures appearing in the cells are all close to 4.57k, which is the total members type in the first bar.

Anyone has any suggestions on how to do it?

[Wlad_Masi]

What result do you get if you drag a table chart and drop on top of the bar chart, selecting convert to table chart?