Canon Community

When I view the picture after I took, but show up with the focus frame (it is square) in the picture, and different picture with different frame, wire. Could someone give me hand, Thanks

why canon lens 100-400 f/4.5-5.6l is usm not fucos well when i taking wild birds,The  lens just in and out when i fucos to the subject and not take a photo, i try many setting but the problem still not solve, The lens is used from adorama tv ,the cam...