Issues with completing & signing

Hi There

I work in a department that has a lot of documents that require completing & signing and have recently purchased Adobe DC to make the process easier and hopefully avoid getting documents back in different formats [word, photographs & scans] which then takes me a lot of time to reformat and save.

So I have converted all of our most common documents to PDF and used perpare form to make the required fields fillable and added signature & date fields where required.

Most people seem able to complete the text fields [although some report that they cannot] but a lot of people are unable to sign and I cannot work out why.

At first I thought that it was people using mobile phones to complete the forms as that seemed to be the most common device people were using, but I have people with the same issue on laptops.

I have just had a screenshot sent [attached as example] where the person can fill their name & date but the signature field is not highlighted and they cannot sign or indeed type into that field.  I have also taken a screenshot of the same document as it should appear [attached as example1]

Can anyone help please, as at the moment instead of saving time this is taking a lot more time.

Many thanks