Uhm, strange. If you see the table from the admin app, after you delete the record there is still the same record on the table ?
This question arises because "delete" attaches a small javascript "onclick" of the delete button that fires an ajax request to delete the record and then removes the row from the DOM. There is the possibility that there's an hiccup in the javascript on the page, that stops this from happening. Also, there is the possibility that the ajax request is fired but not the piece of the "removal" of the row from the actual grid. Just see if the ajax request is made when you press the button or if there are any errors debugging the page, e.g. with firebug.
