Hi Michael,
Thanks for Contacting Syncfusion support.
In order to differentiate between the ‘rowselection’ and ‘rowdraggle’, we have click the row first to drag and drop the row.If you click the row, the row will be selected and it will be able to drag and if you select the row,row will not able to be drag.This is default behavior of the grid.
Please get back to us if you need further assistance on this.
Regards,
K.Karthick.