Yes. I have same. Your shutter speed is too low. It must be a minimum of 1/focal length. Try same at 1/500. Also check your focus point. Best at precisely bird's eye.
I am very unhappy with the sharpness of this photo. f5.6, ISO500, 1/100, 2x extender on a Canon 70-200mm L series f2.8 lens, tripod was used. Because of the extender and loss of f stops I had to use at least ISO 500. This was the first time I have used the extender. The extender is a EF 2x III. Any suggestions to improve sharpness? Thanks.