By default Kendo Grid places a new created item/row at top of the grid in batch / incell edit mode. When saved the item remains top. The items count is increased in this case.
A click on Cancel puts the new item to the end of the grid and the items count is decreased.
There is just a work-around which stops the propagation of the cancel event when the datasource has no chances (thanks to Petur). 
That should be the standard behaviour.