Difficulty adding custom field types with Directory plug-in

Just activated the Directory plugin and have been working through the setup instructions. I'm now on the CustomPress custom field tab and tried creating two fields, address and phone number.

I can successfully create one field. However, when I click "Add custom field" and go through the process of creating a second one, the first field disappears from the Custom Field list.

I have no idea what to do. Thanks for your help!