Edit field text

when I edited a field, the text field is only shown partially, only the lower part underlined.
How do I see the text correctly while I type?

Hello Raffaele,

It’s likely that the field has been incorrectly added to the PDF. If you forward a copy of the PDF, along with a description of what you’re using to create and view the PDF (such as PDFNet SDK version, platform, operating system, etc.), we can take a look and see if we can offer any advice. You may want to send it through support@pdftron.com to keep your content confidential. Thank you.