I save edited pdf but the old information still shows when attaching to email

I have a pdf document that has some text boxes that I edit for each new customer.  

I edit the pdf with the new information or send with text boxes blank for the customer to fill in.

Lately, when I attach the document to an email, it still shows old information in the text boxes even though I have deleted the information and saved as new document.  Not sure why it is picking up the old text boxes.