Rotating an arch warped square not working

So I'm making a feather duster out of vector shapes and to create the arched top I drew a square and applied a 50% arch warp. Then, I used the direct select tool to select the bottom line and delete it. This left me with the arch square path which is perfect. then I added the rest of the vector shapes to create my overall look. Then i selected all the shapes and went to rotate it, and here's my problem: When i rotated the arch square path it turns into a complete different and unusual shape. as if ive further warped it and I don't know what to do because rotating it is essential!!!