Sorry about that; it should say PDFCreator Business inside the application window, too.
I am not sure how this is possible but it seems at least some of the components of your installed PDFCreator belong to the free edition. Normally the setup will block the install until the previous version was uninstalled or uninstall it automatically (depending on the type of setup used). We will look into it. To ensure you have a properly installed PDFCreator Business, please uninstall the current version through the control panel and delete any potentially leftover files inside the PDFCreator installation path (usually %programfiles%\PDFCreator), then reboot and install again. PDFCreator Business uses pdftools to additionally ensure PDF/A conformance after the conversion.
We have also found the cause of the issue inside the free version and it will get fixed for the next update.
The signature is applied after ensuring PDF/A conformance, but it uses a font which then isn't embedded.