Custom registration form not saving data

I'm using the excellent custom menu layout to show only a few fields at registration and most of them collect the data correctly. A few don't despite being visible and published. Layout is as below:

    <tr>
      <td colspan="2">[cb:userfield field="cb_currentemployername" output="htmledit" formatting="div" reason="register" /]</td>
    </tr>
   <tr>
      <td colspan="2">[cb:userfield field="cb_position" output="htmledit" formatting="div" reason="register" /]</td>
    </tr>
   <tr>
      <td colspan="2">[cb:userfield field="cb_workemailaddress" output="htmledit" formatting="div" reason="register" /]</td>
    </tr>
    <tr>
      <td colspan="2">[cb:userfield field="cb_employmentpostaladdress" output="htmledit" formatting="div" reason="register" /]</td>
    </tr>

I can add the data in the backend and it shows. 

Any reason why these are not collecting the registration data?

Thanks
 

It works when the fields are part of a field group though. I might just leave them in the group.

Sorry, I don't understand what you're doing exactly. This is a custom layout where? In a field or within your template?