I have an unpainted 18 x 24″ stretched canvas and just noticed the wood frame (that it is stretched over) is warped. So if it is hung on the wall (unframed) one corner would stick up badly. Is there any way to fix this, or would framing it take care of the problem. Well, I have your answer. Check to see if the wedges are in the corners correctly. If they are then maybe the wood warped on you. You have two options buy another frame and transfer it to the new frame, by taking out the stapes and re-staple it to the new frame or try framing it the way it is and see what happens, it may take out the bow.