Me again, you're going to hate me now
That same site I'm dealing with, when an end user edits their ad from their Dashboard, any fields involving a Drop down or Checkbox do not get updated, you're wondering what that has to do with the plugin, because troubleshooting wise, I deactivated DML, went back and updated the ad, the fields that I changed ended up getting updated.
The only other way those fields could be updated is if I had logged in from the admin panel to update the user's ads, then it would reflect on their end, but won't be able to change them, meaning, if they uncheck or choose a different dropdown field, then Save, the changes wont get saved.
I'm going to install DML on the public test site to confirm this issue and update you.