The worksheet.AutoFitRows() method is adjusting rows to a height that exceeds the native height allowed in Excel. See attached example code.
If you run the test code then look at the output workbook in c:\temp\newbook.xls you should see that the height of row 1 is a lot higher than what Excel will allow. If you attempt to change the row height in Excel, you will notice it is showing the max height allowed and if you click on OK, notice how the row height is reduced.
We have fixed this issue. Please download Aspose.Cells for .NET v188.8.131.52.