You know something is behind say a cage and the camera focuses on the cage instead of the object
First pic came out like this. Using autofocus
Kept on clicking on the focus getting camera to focus again and again and finally managed to get a clear shot. Took a few tries.
I couldn't do the same for every shot though. Seems like it was a random occurance. Actually if i need to refocus camera for every shot i take of birds behind the cages it would take a long time.