[EN] false positive: on the top (of the screen)

“the top of the screen” is one of the few cases where both “at” and “on” can be valid, but LT only accepts the (in this context) potentially less precise “at”.
(EG “you’re on the top of the screen” indicates top-row, but “You’re at the top of the screen” can mean the few highest rows instead of just the top-row)