Radio Button Groups moving in the tabbing order

I am creating a form with a radio button group that has 6 selections.  I am starting with a PDF I created from a word document so as I add the radio buttons next to the text of the radio button they are at the end of tabbing order for the page. To correct this I moved the Radio Button group to the correct position on the field list, the radio buttons are showing consecutive field numbers. When I open the tab order list each radio button is showing the same number so when I tab through the tab goes to the first radio button skips the rest of the radio buttons in the group and goes to the next input field. All the choice names are unique. 

Any suggestions? Thanks