Jogan, those markings on the angle bar are not absolute, rather an approximation. Just an indicator. These indicators correspond to certain knife size and clamped position W.E chose to use to calibrate the device with, while making these angle markings. These markings are only intended to give you an idea but are not a true value of your angle. Your observation is correct and to determine your actual relative angles employing an angle measuring device like a properly zeroed digital angle cube or digital Protractor is the best way to go.
Many W.E. users have actually flipped the angle bar over to position the angle inscriptions to the rear where they can’t be seen. Be assured these markers do not take away from the precision of your sharpening results. IMO, employing the digital angle measuring device actually improves the accuracy and precision of your sharpening results.
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