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Hello,
I had the same issue and found a solution.
The problem occurs when the image you're trying to create positive samples for is not a square.
Wrap your image into a black square and make the black color transparent when using opencv_createsamples (put parameter -bgcolor to 0). Also if you specify width and height parameters make sure they are the same to fit your squared image.
Fixed it for me, I guess the rotations applied by opencv_createsamples turns a square containing your object into a square containing your object but doesn't turn a rectangle containing your object into another rectangle containing your object.
Hope this helps :-)
Hugo
