email and curl submitting twice

Question

Debug info below which shows the email being sent twice, its received twice also.

Configuration data replaced with xxxx for security reasons.

Array
(
    [13] => Array
        (
            [Email] => Array
                (
                    [0] => An email with the details below was sent successfully:
                    [1] => To:xxx
                    [2] => Subject:Storage Quote - New Lead
                    [3] => From name:Sentry Self Storage
                    [4] => From email:
                    [5] => CC:
                    [6] => BCC:
                    [7] => Reply name:
                    [8] => Reply email:
                    [9] => Attachments:
                    [10] => Array
                        (
                        )

                    [11] => Body:
<table>
<tr><td>Select your location</td><td>Andover</td></tr>
<tr><td>Space Required</td><td>40</td></tr>
<tr><td>When </td><td>Urgent</td></tr>
<tr><td>First Name</td><td>jon</td></tr>
<tr><td>Last Name</td><td>hastin</td></tr>
<tr><td>Email</td><td></td></tr>
<tr><td>Telephone</td><td></td></tr>
<tr><td>Comments</td><td></td></tr>
</table><br /><br />IP: xxxxxx
                    [12] => An email with the details below was sent successfully:
                    [13] => xxx
                    [14] => Subject:Storage Quote - New Lead
                    [15] => From name:xxxx
                    [16] => From email:
                    [17] => CC:
                    [18] => BCC:
                    [19] => Reply name:
                    [20] => Reply email:
                    [21] => Attachments:
                    [22] => Array
                        (
                        )

                    [23] => Body:
<table>
<tr><td>Select your location</td><td>Andover</td></tr>
<tr><td>Space Required</td><td>40</td></tr>
<tr><td>When </td><td>Urgent</td></tr>
<tr><td>First Name</td><td>jon</td></tr>
<tr><td>Last Name</td><td>hastin</td></tr>
<tr><td>Email</td><td></td></tr>
<tr><td>Telephone</td><td></td></tr>
<tr><td>Comments</td><td></td></tr>
</table><br /><br />IP: xxxxxxx
                )

        )

    [21] => Array
        (
            [Curl] => Array
                (
                    [0] => CURL OK : the CURL function was found on this server.
                    [1] => $curl_values: firstname=jon&lastname=hastin&email=&telephone=&When=Urgent&spacerequirement=40&location=Andover
                    [2] => curl_target_url: xxxx
                    [3] => curl_errors: 
                    [4] => curl_info: Array
(
    [url] => xxxx
    [content_type] => text/html
    [http_code] => 200
    [header_size] => 167
    [request_size] => 244
    [filetime] => -1
    [ssl_verify_result] => 0
    [redirect_count] => 0
    [total_time] => 0.109
    [namelookup_time] => 0.015
    [connect_time] => 0.031
    [pretransfer_time] => 0.031
    [size_upload] => 96
    [size_download] => 2
    [speed_download] => 18
    [speed_upload] => 880
    [download_content_length] => 2
    [upload_content_length] => 96
    [starttransfer_time] => 0.109
    [redirect_time] => 0
    [redirect_url] => 
    [primary_ip] => xxxx
    [certinfo] => Array
        (
        )

    [primary_port] => xx
    [local_ip] => xxxx
    [local_port] => xxxx
)

                    [5] => CURL OK : the CURL function was found on this server.
                    [6] => $curl_values: firstname=jon&lastname=hastin&email=&telephone=&When=Urgent&spacerequirement=40&location=Andover
                    [7] => curl_target_url: xxxxx=
                    [8] => curl_errors: 
                    [9] => curl_info: Array
(
    [url] => xxxxx
    [content_type] => text/html
    [http_code] => 200
    [header_size] => 167
    [request_size] => 244
    [filetime] => -1
    [ssl_verify_result] => 0
    [redirect_count] => 0
    [total_time] => 0.093
    [namelookup_time] => 0
    [connect_time] => 0.015
    [pretransfer_time] => 0.015
    [size_upload] => 96
    [size_download] => 2
    [speed_download] => 21
    [speed_upload] => 1032
    [download_content_length] => 2
    [upload_content_length] => 96
    [starttransfer_time] => 0.093
    [redirect_time] => 0
    [redirect_url] => 
    [primary_ip] => xxx
    [certinfo] => Array
        (
        )

    [primary_port] => xx
    [local_ip] => xxxx
    [local_port] => xxxx
)

                )

        )

)