I raised this through the official support too and have had the following response:
The main problem was with the data format of columns of DataTable which we have to filter. In case you create a datatable using “Build DataTable” activity, you can chose column dataType as Int32 or String, hence, filtering was working flawlessly.
Hence, we have picked each cell element and converted to the required data format & saved it to another DataTable as shown in attachment. This has returned the required result. We recommend you to perform the same. Also, the excel sheet you shared had formula for changing “Age” column, so we have kept fixed values to check the result.
Please note, changing data format at excel will not help, as all values are taken by default as generic.
The support guys said they would get the vid/workflow updated too.