Hi Pawels,
Thanks for using Syncfusion products.
We are able to reproduce the reported issue and we have
confirmed “Same data in all details row
after performing grouping in grid” as a defect and have logged a defect report on
the same. The fix for this issue will be available in our Volume 2, 2014
Service Pack Release.
Please let us know if you have any queries.
Regards,
Madhu Sudhanan. P