Word2010 form to PDF - check boxes aren't recognized by Acrobat 10

Hello fellows!

I've encountered a weird problem - when converting a form created in Word 2010 to PDF and running the field auto-detection wizard in Acrobat 10, the check boxes originally created in Word are recognized by Acrobat as text fields and not controls. Tried replacing the word 2010 check box with a "legacy" check box - no difference. Any suggestions?

Thank you in advance!!!