You will see at the bottom right how the letters have appeared that dont belong.  Part of the S and F.  Hit F7 and go back one step and we'll have a look and see how to fix this.  Always note in the Time Column exactly where I am in these pictures, if you happen to get lost. :)
Ok, you can see where the little box is in the above picture, and below you can see where it should be.  Just click where it belongs.  To help you get it in the right position take note of the co-ordinates in the Edit Tile Co-ordinates box in the Edit Window.
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