This is a known problem. It is generally due to a 'Force stitched' image. You should unstitch this one and just drop it into its place. Carry out the render again. It should be better this time.
If it is not the case, you can also go in the 'Rendering options' window of the render window and set the Mixing method to 'Blending' instead of 'Warping' as the default. It should work better then.
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