We have tested this issue with the following sample code using the latest version: Aspose.Cells for Java v9.0.3 and found the issue as per your description. Cell's text overflow to next cell.
We have logged this issue in our database for investigation. We will look into it and fix 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
CELLSJAVA-41994 - Cell's text overflow to next cell