Thanks for the template file and PDF file.
I checked your template file and found a print area (“B1:AC10”) is set for the second sheet (check Page Setup| Sheet tab). That’s why you are getting partial conversion. Even you may take the print preview of the sheet in MS Excel manually and can see same display as per output PDF by Aspose.Cells APIs. Please either remove the printable area in MS Excel manually and re-save the file and then use your code to convert to PDF file. Alternatively, you may try the following sample code for the task, so the whole worksheet should be rendered:
Worksheet worksheet = workbook.Worksheets;
worksheet.PageSetup.PrintArea = "";
Let us know if you still find any issue.