Hi Aspose Team,
Thanks for your posting and using Aspose.Cells for GridWeb.
We were able to replicate this issue with your source file. GridWeb does not recognize the subscript and superscript text. We have logged this issue in our database. We will look into it and resolve this issue. Once, the issue is resolved or we have some other update for you we will let you know asap.
This issue has been logged as CELLSNET-41804.