Fix Tab Order in Acrobat Accessibility Check Creates Incorrect Tab Order in Form

I have a form that was converted from Word to PDF, in which the tab order is correct when I tab through it.  I run the Accessibility check, and an error appears for Tab order in the Page Content section.  I click on Fix, tab order is then set to match the structure order.  I then tab through the form and the tab order is wrong.  I then open Prepare Form, and manually fix the tab order.  Run the Accessibility check, and the error appears again for Tab order in the Page Content section.  How do I fix this?