it could be the wall in the background playing tricks with me,but it looks like you have a couple of slight hinges on top and bottom ,but more on top
right were the corner of the wall sits,you can see them in the braced pics to. but if it shoots good I wouldn't worry to much,especially for your second bow.plus hickory and elm is a tough combo it should be able to take it. it could just be an optical illusion. nice work