CFchart simple line

Edit: I figured out why it's duplicating. <cfchartseries type="line"
    query="GetJITmemberData"


This is my first attempt at cfchart.  It's a simple line chart that show the number of members since inception. The first problem is the chart seems to run twice.  The first part seems ok. The second part seems to chart without dates along the bottom and no aggregate number of members.  The second part is figuring out how to fill in the missing dates so the chart will be balanced and scale at the first day of each month.

<!--- Get the raw data from the database. --->
<cfquery name="GetJITmemberData" datasource="#request.dsn#">
      select  CONVERT(VARCHAR(10),signup_date,111) as sdate, count(id) as idcount
      from signup_temp as s
      where isnull(s.userid,0) > 0
      and entry_point = 10
      and left(s.signup_date,10) > ''
      <!---and s.signup_date between '2012/04/13' and '2012/07/23'--->
      group by CONVERT(VARCHAR(10),signup_date,111)
      order by sdate
</cfquery>

<cfchart format="flash" title="Rate of JobsInTax member growth since launch"
    xaxistitle="Date"
          yaxistitle="Number of Members"
                   chartHeight="600"
                         chartwidth="950"
                               gridlines="7"
                                     labelformat="number"
                                           xaxistype="category"
                                                 scalefrom="0"
                                                       scaleto="300"  
                                                             fontsize="14" > 

<cfchartseries type="line"
    query="GetJITmemberData"
    itemcolumn="signup_date"
    valuecolumn="idcount">
      
<cfset membercount = "0">
<cfloop query="GetJITmemberData" >      
      <cfchartdata item="#GetJITmemberData.sdate#" value="#membercount#">
      <cfset membercount = "#val(GetJITmemberData.idcount)#" + "#membercount#">
</cfloop>

</cfchartseries>
</cfchart>


The data is;

2012/04/20      7
2012/04/23      1
2012/04/25      1
2012/04/26      2
2012/04/27      1
2012/04/30      2
2012/05/01      1
2012/05/02      1
2012/05/03      1
2012/05/06      1
2012/05/07      1
2012/05/08      1
2012/05/09      5
2012/05/12      2
2012/05/15      1
2012/05/23      1
2012/05/24      1
2012/05/25      1
2012/05/28      1
2012/05/29      1
2012/05/31      1
2012/06/01      1
2012/06/03      2
2012/06/05      1
2012/06/07      3
2012/06/08      2
2012/06/11      4
2012/06/12      1
2012/06/13      3
2012/06/14      2
2012/06/15      2
2012/06/18      1
2012/06/19      2
2012/06/25      1
2012/06/27      2
2012/06/29      1
2012/06/30      1
2012/07/10      1
2012/07/12      2
2012/07/13      5
2012/07/15      1
2012/07/16      1
2012/07/17      2
2012/07/18      7
2012/07/20      2
2012/07/21      1
2012/07/23      1
2012/07/25      1
2012/07/26      1
2012/07/27      2
2012/07/28      1
2012/07/30      3
2012/07/31      2
2012/08/01      2