Blog comments Captcha Refreshes Page to Validate It

I have the bult in captcha enatable for blog comments. However, I tried testing to see if it would submit with the captcha field empty.

When I hit the submit button it refreshes the page. It does validate the form and I see the "Please enter a valid security code" message

My question is, why does the page refreshes after submit if the captcha field empty? With the other FIELDS, it's displays the validation message.

I would check the following:

Make sure that the Catcha is marked as a required field. This will simply check that something (anything) has been entered. The captcha validation itself is sever side, so it need to do a submit.
In the On-line form web part, check Ajax > Use update panel. The prevents the whole page from reloading, focusing instead on the form.

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