CFGRID issue

I have a simple grid with Cold Fusion 9.0.2

<cfquery datasource="db" name="q1">

          Select 'a', 0

          union

          Select 'b', 0

          union

          Select 'c', 0

          union

          Select 'd', 0

          union

          Select 'e', 0

          union

          Select 'f', 0

  </cfquery>

<cfform name="formgrid" action="customersku_submit.cfm">

    <cfgrid name = "gridname" format="html"

        selectmode="edit"

        font="Tahoma" fontsize="12"

        query = "q1">

    </cfgrid>

    <cfinput type = "submit" name = "submit" value = "Submit">

</cfform>

If I click the number value for a and enter 1 and then click to the number value on field f and press submit it returns the value I changed not as the a but as the f.

structFIELDNAMESSUBMIT,__CFGRID__FORMGRID__GRIDNAMEGRIDNAME.COMPUTED_COLUMN_1

GRIDNAME.COMPUTED_COLUMN_2

GRIDNAME.ORIGINAL.COMPUTED_COLUMN_1

GRIDNAME.ORIGINAL.COMPUTED_COLUMN_2

GRIDNAME.ROWSTATUS.ACTION

SUBMITSubmit__CFGRID__FORMGRID__GRIDNAME__CFGRID__EDIT__=2 COMPUTED_COLUMN_1 Y COMPUTED_COLUMN_2 Y 1 U f f 1 0