This project illustrates an issue with WPF SfDataGrid. It seems that if you set the RowHeight to certain values (e.g. 15.66) and you have a top summary row, the first row of the data is not displayed. See print screen MissingFirstRow.png. If we set the RowHeight to 15.6 or 15.7 it works fine, but 15.66 seems to cause problems.