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I've seen the same thing on my HDS (no Structure Scan). I had found some vertical cane where the tops were sticking out of the water. Water depth was about 8 feet. Since I was still learning my HDS I decided to troll back and forth by the cane top to see what the screen looked like. If I got almost right on top of the cane my screen had a bunch of blobs ( I assume all of the small branches) from the top to almost the bottom. If I got more than a few feet away, all my screen would show was an angled line (I assume the main trunk of the cane). The angle semed to depend on which side of the cane I was on when I trolled by it.
So, I say he was seeing two pieces of cane. He was just not close enough to get the blobs on the screen.