Stamps and Images I have added to a PDF appear excessively large when client receives PDF.

 I have come accross a strange issue. I have created order forms and documents for consent in a commercial setting. When sending these documents I insert both custom stamps as well as images in order for the clients to sign for official documentation. Using E-sign is borderline unusable because our typical clientel are ederly and not the most technilogically functional. My most common was of recieving signed documents back after emailing them is either Fax, physical mail, or cell phone pictures.

The problem is that when I view the PDF of my computer the stamps and the images are the correct size.

When I send them to the clients the stamps and the images show up massively blown up and covering important information.  I have attached a PDF with examples of what I sent and with what the customer sees.

I have not been able to figure out why this is occuring. Any help with this would greatly be appreciated.