Sorry for the delay in response.
As per the issue description mentioned above, when editing a pdf, 0 is being written as u, is that correct?
Could you please share the version of Acrobat installed on the machine: Identify the product and its version for Acrobat and Reader DC
And, the operating system running on the machine-Mac/Windows?
Have you tried editing other pdfs? Does this behavior also seen when you type in other applications like MS Word/TextEdit?
Awaiting your response.
That wasn't quite what he or she said. 0 was being written as ü, u with an umlaut.