standalone registration thank you redirect

So I’ve had this problem on every EE site I’ve created a standalone registration form for and I’m really hoping someone can help me isolate the problem. Currently running 2.5.3.

After registering the user sees the thank you message but isn’t redirected after the usual 2-3 seconds like they are after say logging in. The url seems to be correct, but the page isn’t loaded. If someone can help me with this I will send a paypal payment your way. It’s killing me.

Is there a preference somewhere that I need to change or possibly an issue with the registration code? Below is the the top bit of my standalone template. I’ve replaced my site’s name.

<form id="register_member_form" method="post" action="http://mysitename.com"> 
    <div class='hiddenFields'>
        <input type="hidden" name="XID" value={XID_HASH} /> 
        <input type="hidden" name="ACT" value="<?php echo $action_id; ?>" />
        <input type="hidden" name="RET" value="http://mysitename.com" /> 
        <input type="hidden" name="FROM" value="" /> 
        <input type="hidden" name="site_id" value="1" /> 
    </div> <!-- closes out hiddenFields -->