Radio buttons change format

[barbarap87060898]

I have set up a list of 3 items using radio buttons - I have formatted them to look the way I want - which is a square with ta checkmark.  It looks fine, even works fine when I review it.  However, if I send it to someone, the form they received shows the radio buttons as circles and fills them in when selected.  I have looked and searched but can't find any answers to why this would be. 

Any ideas out there?  I don't think this should be so complicated. 

[ls_rbls]

Hi,

Confirm with the recipient if they are viewing the form with a web browser or a third-party document viewer instead of Adobe Reader or Adobe Acrobat Pro.

[JR Boulay]

Are these buttons made with InDesign?