Custom Fields-- why are values recorded as "true/false?"

Hi,

We’re using Marketo forms 2.0 and having some trouble with two new custom fields I created. FYI the names of the custom fields I created are “Preferred Contact Method” and “Offers”—if you want specifics.

For “preferred contact method,” I am looking for one of three values to be passed to the appropriate record, either “email”, “phone,” or “no preference.”  However, right now if someone submits a form, the values captured say either “true” or “false,” which I was not expecting.  The same is true for my “Offers” field. Values captured say true/false.

Backtracking to Setup:
Within the Form Properties, the field type is set as “select” for one and “checkbox” for the other, while in Marketo Field Management, Boolean is the type listed for both. I set the values in the Form Properties, and they seemed to display just fine in my form, but something went wrong on the backend.

My hunch is that I chose the incorrect type in the Admin Field Management section, but I’m not sure what I would change it to to fix my problem.

Any suggestions would be greatly appreciated! Thanks!