Thank you for contacting Aspose support.
I am afraid, it will not be possible for us to investigate the said matter unless you provide us an executable sample application along with the problematic spreadsheet as well as complete environment details as follow.
- Operating system version & architecture
- JDK vendor, version & architecture
- Aspose.Cells for Java version
- JVM arguments, if any
- Locale/region of the machine
Before you move forward to provide us the above requested information/artifacts, please give a try to the latest version of the API, that is; 16.10.6 at the moment. I have attached the latest build with this post for your testing.