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The LBP, HAAR, HOG detector still detect faces even at "wrong" scales due to the great capabilities of the model to fit something similar to a "face" in "tricky" conditions. You are probably detecting faces at a wrong scale and the fine tuning of the position of the face (or sub-parts of the faces) fails.
Have your tried to print the detected faces at those scales?
For an expert point of view about the opencv cascades with opencv 2, 3, and 4 take a look here: http://www.vision-ary.net/2015/03/largest-boosted-cascades-opencv-lbp-haar-hog/
Regards!
