Hi Denise,
Unfortunately not that technical - but a bit scary of the remark 'defaulted all others to the homepage' - it sounds a lot like the 'common mistakes' on this page: https://developers.google.com/webmasters/mobile-sites/mobile-seo/common-mistakes/faulty-redirects?hl=en
Isn't your mobile site a 1-1 copy of the desktop version?
Are you using a CMS or is your site plain HTML. If you manage the pages in Dreamweaver - you can add the rel="alternate" in the section of your HTML. If it's a CMS, you'll probably need to Google a bit to find out how you can implement it.
rgds,
Dirk
