TSVB Data Table Sorting Return Different Columns Value


I'm using Kibana 7.8.1 with TVSB Data Table, but when i click on the sort on some of the columns, the values on the several columns were different that its original value.

Following are an example contains only 4 of the many columns in my data table, notice sorting on column A and column C yields different result on column C & D which is puzzling.

Column A - Group by A.keyword
Column C - Aggregation Count
Column D - Sum of field d



Hope you could shed some light regarding this. Thank you!

More finding, it seems happens to index pattern that involve multiple indices.
Please advise! Thanks.