You are correct in wanting to turn the images upside down. Your brain has learned to "know" that light comes from above. When that perspective changes as in these images you "see" incorrectly. I have seen this even in a Newtonian telescope when viewing the Moon. A book titled "Visual Intelligence" helps to explain this and other ways that your vision is a construct. Its a very interesting book. Hope this helps. And yes with a little practice you can "flip" them in your mind. I think some details become easier to study when inverted, if you will.