Yup, JMC has shown pics a few times with it, a little tab that both protects the tip and gives a spot for your fingers when working further back on the blade. What causes it is the fact that there's so little material there you are grinding the tip off faster than you can see it happening. It generally happens when you run the blade off the edge of the belt, it just slices the tip right off. I used to do this a lot and have stopped pulling the blade that far over, I lift before the tip is pulled past the edge. I haven't used JM's trick yet, but do leave extra on my spine and a little extra thickness near the tip until I'm about done. That way I can shape the tip on its own, carefully and gently.
If you want a bit more of a point on what you have now you'll probably have to do some re-sculpting. Bring the edge back a bit and regrind till it's the right thickness again, maybe tweak the drop on the spine a little. Usually when I have a problem with the shape I take what I have and trace it on a piece of paper then use pencil and eraser to play with it and see where I want to go.
