Strange orange object - Any explanation?

These three pictures were taken in August 2015 in the Pamporovo resort in the Rodopi mountains (Bulgaria). At that time Svetla and I noticed the orange object only on the top picture. But recently I have found two more pictures (second and third below) with the same orange object and noticed that the orange object was behind the bush (the second picture) which, I think, is really strange.

What is the orange object? This picture was taken on the same day as the pictures below, but at a slightly distant location.

The orange object is not a reflection (or a camera problem) since it emerges from behind the bush.

This picture was taken probably only several seconds after the above picture (and again the orange object is partly behind the bush).

This picture was taken on 28 January 2017 in Cuba with the same camera (Nikon AF-S NIKKOR 18-25mm f/3.5-5.6G VR) as the above pictures. It seems the same orange object is there again. Well over 2000 pictures were taken in Cuba during our last four visits (2014-2017) with the same camera and the orange object appeared only on this one. If it were a camera problem, I guess, it should have appeared more often. However the toughest question the "camera problem" explanation should answer is how the orange object (if it were a camera problem) managed to hide behind the bush in the second picture (from above).

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