Filling text form in preview on mac creating another layer behind the field

[#1]

I have created some PDF's with fillable text forms. When some users are attempting to fill out the form in preview on a mac they are having some wierd issuesL
- the field duplicates behind the clicked field, in another font
- when they try and start typing, the curser moves to the bottom of the paragraph and its complately unsuable. 
Has anyone seen this? How can I fix it?

[#2]

I have created some PDF's with fillable text forms. When some users are attempting to fill out the form in preview on a mac they are having some wierd issuesL
- the field duplicates behind the clicked field, in another font
- when they try and start typing, the curser moves to the bottom of the paragraph and its complately unsuable. 
Has anyone seen this? How can I fix it?

[#3]

Don't use Preview to fill forms. For many years it has been broken, and Apple have no interest in fixing it. Your users MUST be led to use the right software - Acrobat Reader. They also need to avoid browsers and email apps.

[#4 · Accepted solution]

Preview should never be used for PDF forms. There are a number of very good reasons for this, but in general, it has lousy support for forms and even damages them in a number of ways when it saves. If you want a PDF to work correctly, it is best to use Adobe Reader or Acrobat.