Overscan! I completely forgot about it! It's so many years I have digital display with no overscan...
By the way, the image is 16:9 so it SHOULD be projected with the black bars too - unless someone set his video projector to 21:9 and chop those black bars, along with those "poor" subtitles...
Well, it seems I should leave them as in the original BD, untouched, wherever they will appear!