Sarah mentioned to me that Stunt is having trouble with the rotate tool in the newest CalChart. I tried it for myself and had the same experience. Right now, all point positions are snapped to the grid for all tools, so if you try to rotate a shape, you won't get a pure rotated version of the original shape.
I've attached screenshots showing a starter formation, a centered CROSSHAIRS position, and the result of a 45 degree rotation around that CROSSHAIRS.



Note that the formation is not a purely rotated version of the original because the marchers are snapped to the grid.
Here is the behavior of 3.4.4, which works as I would expect:


