[TYPO3] FlexForm Problem Here?

[Gilles Deacur]

This is my FlexForm data:

1: <?xml version="1.0" encoding="iso-8859-1" standalone="yes" ?>
    2: <T3FlexForms>
    3:     <data type="array">
    4:         <sDEF type="array">
    5:             <lDEF type="array">
    6:                 <field_right_column type="array">
    7:                     <el type="array">
    8:                         <numIndex index="1" type="array">
    9:                             <field_main_content type="array">
   10:                                 <vDEF></vDEF>
   11:                             </field_main_content>
   12:                         </numIndex>
   13:                         <numIndex index="2" type="array">
   14:                             <field_main_content type="array">
   15:                                 <vDEF></vDEF>
   16:                             </field_main_content>
   17:                         </numIndex>
   18:                     </el>
   19:                 </field_right_column>
   20:                 <field_left_column type="array">
   21:                     <el type="array">
   22:                         <numIndex index="1" type="array">
   23:                             <field_side_content type="array">
   24:                                 <vDEF></vDEF>
   25:                             </field_side_content>
   26:                         </numIndex>
   27:                     </el>
   28:                 </field_left_column>
   29:                 <field_main_column type="array">
   30:                     <vDEF>167,168,162</vDEF>
   31:                 </field_main_column>
   32:                 <field_side_column type="array">
   33:                     <vDEF>170</vDEF>
   34:                 </field_side_column>
   35:             </lDEF>
   36:         </sDEF>
   37:     </data>
   38: </T3FlexForms>

I believe when I mapped my template the 1st time, I used the descriptors 
"field_left_colmun" and "field_right_column"

I have since remapped it and called them "field_side_column" and 
"field_main_column".

My left (side) column isn't displaying, so I checked the FlexForm XML 
and see that my obsolete descriptors are being used.

Is this why it's not showing?

How do I delete the references to the obsolete descriptors?