Self Checkout

i see some Walmarts have upped their self checkouts. while i was checking out, a screen popped and said possible unscaned item (or something like that) and the red light came on over the register. she came over there and put her code in, and the video showed me putting something in the bag that it thought i didn't scan. but she looked on the screen and saw it on the list of items i scanned (bag of oranges).