That's the big problem. They are not present in the slidlemanager so you can't choose any URL they redirect too. And you cant choose the order when they need to appear
Go to PhpMyAdmin and search for Toc_slide_images and if its right there are like 10 banners that are not showed in the slide manager.. Delete every banner showed and go back to the slide manager. It should say: No banner to show or something like that (I got my language in dutch). And now you can add them freely!