If anyone is having trouble with the confirmation page not going to your designated Returl URL in IE (11 at least, haven't tested older versions), try this.
Edit confirmations.php in the includes directory. Line 71 reads:
<meta http-equiv="refresh" content="10;' . $the_petition->return_url . '">
<meta http-equiv="refresh" content="10;URL=' . $the_petition->return_url . '">
adding URL= right after the semi colon. IE likes seeing that, otherwise it just loops on the same page.
You can also reduce the wait time, 10 seconds is default here, I use 5.
Keep in mind you have to edit it again on updates unless Kreg fixes it in the next release. the change works in Chrome & FF as well.
Hope that helps someone