Inset problem

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So I'm doing the chess exercise in my intro to 3ds max course and I need to use the inset command for the rook for the battlements. However, when the inset is applied, the polygons go all over the place from the middle. What am I doing wrong? How can I fix this? No matter how many times I delete this object and redraw the line from scratch, when I get to this stage it fucks up again.