Instead of aggregating two similar records flexmonster is displaying them saperately

Hello Ankush,
Thank you for your question. We have checked the suggested jsfiddle and found that the behavior does not look correct. The component should not divide those members into separate instances but should aggregate them under one value. Our dev team will prepare the necessary fix in the nearest minor release ETA Oct 8.
Meanwhile, we recommend adding the meta object for your JSON data source with the types specification. Such an approach allows to overcome the issue and the data is aggregated correctly. Please find more information here: https://www.flexmonster.com/doc/managing-data-presentation-json.
Let us know if everything works fine for you.
Regards,
Dmytro