I agree with Sarah - it is the chromatic aberration. Often happens when you use the lens at the most end or beginning of the zoom, shoot against light, be in a certain angle against the light...
What I often try, is using the Sponge Tool (Desaturation option) and go over these coloured lines. By desatrating those intense colours, the image still remains whole and the colours don't scream out so loud anymore.
Jacqueline
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