There is no relationship between the Month column of the Query1 table and the month column of the DataTable. Create that relationship. Thereafter, when you click on October in the slicer, rows in the table will show up. For any other month that you select, no row will show up because there is no data for those months.
As what @Ashish_Mathur said, there is no relationship between the tables, so when you click slicer, there is no impact on the table visual. And there are no other month's data except october. When you select April, It should change the Table Data for Appropriate month by sorting from JAN to DEC, why it should show the 12 month's data when you click April? It's really confusing. Please share more details for further analysis.