@Laurens You definitely have a dual bevel. Everything that
@Draco Noir said was spot on. A piece of tape on the spine would definitely make the biggest difference. Don't kick yourself over it as this is a common mistake that I see quite often and I'm glad we have an example here as I will do my best to describe the issue and solution in writing.
Having a basic understanding of bevel angles is very important when honing straight razors due to the spine thickness having full control on the angle of the bevel (take note of this). Here we have 2 different angles which is called a dual bevel, the most common cause for this is due to the razor being previously honed with a one or more layers of tape which will lift the spine changing the bevel angle. This may well be the case with this razor, you have actually starting cutting into fresh steel above the edge which is the lighter texture at the top, the darker texture down the bottom is where it hasn't made any contact with the whetstone and it's actually someone elses edge.
The solution for this would be to apply a layer of tape as suggested in the previous comments, kill the edge by swiping it once on either glass or the corner of the whetstone to start fresh, the edge will be dull and won't pass the TNT which means you do not come off the 1k until it does pass, if you don't kill the edge before restarting, you may be deceived and not be able to tell if you've actually made contact with the edge or if you're still working on that same edge you have in the photo. You can even try to shave some arm hairs off the 1k and it should do it without too much effort. Check often under the scope before moving on to make sure that you only have one bevel and that the angle striations (scratches) go from the base of the bevel all the way down to the very edge before moving on. Everything else should be very straight forward providing that you've set the bevel quite well.
Some Tips on your progression:
The Naniwa 1k is an efficient bevel setter, however, the particle size on the 4k norton aren't much finer than the Nani 1k believe it or not due to eastern vs western variations in the standards for grit rating. I suggest you only do X strokes after the 1k, don't be scared to do plenty on the 4k and remember that you cannot over hone on neither the 4k or 8k side of the norton. When you get to the naniwa 12k which is significantly finer than the Norton 8, you want to be extremely light and use practically no pressure (same with the 8k). Start by doing 15 strokes on the 12k and check the edge for a very uniform scratch pattern, if in doubt, you can go back to the 12k and do 5-10 strokes at a time and check the edge once more, or even do a HHT. If you feel that the edge needs more polishing, strop the razor before going back to the 12k again, that prevents over honing and reduces the chances of forming a false edge. That's about the best way I could put it in writing without making it too long, I highly recommend that you take notes on those tips or bookmark this thread as it's only normal for us to forget. Good luck my friend, keep at it and let us know how it goes.
Important tip:
Make sure you flatten your stones often, especially the 4k norton as it dishes quite easily lap it before every use. Any bevel setter, your Naniwa 1k should also be flattened before every use (except for diamond hones of course).