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My guess is you've bumped the shutter button when moving the camera. You say the shutter speed was about 2 sec... It looks like you've opened the shutter just as you're about the move the camera, hence the faint image of the front of the shed, then as your moved the camera to the right the light has come into the FOV from the right.
I'd say its one exposure but your subject matter has changed with 2 periods of relative stability at the start and end of the exposure.
Al.
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