Please download and use our latest release of Aspose.Cells Aspose.Cells for .NET 7.2.1. I was unable to reproduce this issue with our latest version. You can see the source as well as target workbooks in the attached snapshot.
Damage to the file was so extensive that repairs were not possible. Excel attempted to recover your formulas and values, but some data may have been lost or corrupted.
We tried using code with even v7.2.1.0 with your template file, it worked fine as Kashif mentioned.
If you still find the issue, kindly create a sample console application with v7.2.1.3, zip it and post it here to show the issue (with all the files), we will check it soon. Also, attach some screen shots to point out the error messages in MS Excel.