I have tested the scenario where I have tried converting the pages of attached PDF document into JPEG image format while using Aspose.Pdf for .NET 6.3.0 and I am unable to notice any problem. The images are properly being converted. Please try using the new version and in case you still face any problem or you have any further query, please feel free to contact. The resultant Image files that I have generated are also in attachment. Please take a look.