File show up after being deleted

Using the remote web control, I have done a delete all several times and have come back in at a later date to see the previously deleted files all there again while subsequently loaded files are not displayed. If i try to select one of the ‘deleted’ files I get the error that the file cannot be found (as I would have expected.)

Is this a known issue or not?

after restarting the controller this stopped occurring however I had done the delete all from both the touch screen as well as the remote browser.