it's the captcha that is failing validation.
this code generates the captcha image:
<img id="capt1" src="webassist/captcha/wavt_captchasecurityimages.php?width=150&height=40&field=Security_Code_1&bgcolor=FFFFFF&transparent=0&bgimage=&gridfreq=20&gridcolor=000000&gridorder=behind&noisefreq=20&noisecolor=000000&noiseorder=behind&characters=5&charheight=&font=fonts/MOM_T___.TTF&textcolor=336666" alt="security code" width="150" height="40" /><img src="webassist/captcha/images/refresh.png" height="18" onclick="document.getElementById('capt1').src+='&ref=1'" />
this is passing a number of variables to the webassist/captcha/wavt_captchasecurityimages.php page as URL variables.
one of those variables is named field. the field variable is used to set the captcha session name, in your code, the filed variable is set as:
the captcha session name will be set as "captcha_<Field URL variable Value>", so in this case, the captcha session name is set as "captcha_Security_Code_1"
The problem is that in the Server Validation behavior, you have the Like Entry validation to use the session named "captcha_Security_Code" instead.
Edit the server validation server behavior, and change the like entry validation to use the captcha_Security_Code_1 session as the comparison value