Washing Line animation Cycle

This Animation is of a washing line blowing in the wind, for this task i did a quick 1 second cycle of the cloths blowing then copied and pasted the cycle to make the animation longer, this is a good process to use when you have something that doesn't move much in a scene.
When scanning this animation into istopmotion the lighting changed for one of the frames causing it to be brighter for 1 frame each time it cycles.