I have again tested this issue, with the file you shared earlier, using Aspose.Pdf.Kit for .NET 4.3.0 and 4.4.0 and I couldn’t notice any problem; the fields are filled properly and the output file is still editable.
Can you please make sure that you’re using the latest version at your end? Please remove any existing reference to the DLL, build the project, add reference to Aspose.Pdf.Kit for .NET 4.4.0 DLL and rebuild the project.
If you still find the same issue at your end then please share whether you’re having this issue with the same file you shared earlier, or this is the different file. If the file is different and problem persists at your end then please share the PDF file with us, so we could test it at our end.
We’re sorry for the inconvenience.