Check the rectangle shapesheet and verify that LocPinX = 0.5*Width, and LocPinY = 0.5*Height.
Note, for hexagon, you don't need the intersecting lines to find the center. From hexagon shapesheet, the above settings produce precisely same spot. All you need to do is select the hex and then rectangle and align for middle and center. Then deselect all. Reselect rect, and set its angle as desired. It will rotate about the LocPin location. Repeat for the other two rectangles.
@Vojo: what kind of pie?