I have never run a system in tablet mode so I am not familiar with its operation. But in Windows 8, many options are started at the top of the screen. Things like options for an app or pulling it down from the top by swiping down. Can I assume those type of things are not working also?
Are there any updates for the driver for the touch?
There may have been a problem with the screen manufacture or design. The situation may be limited to your unit or it ay be all of them, perhaps someone else who has one could verify the situation. If not, maybe there is a group of Lenovo users which could help. I can't think why the focus would be active a half inch from the actual touch point in only a certain part of the screen.
Do you know what type of touch screen it is? Maybe 10 point and capacitive or some other description?