Without knowing more information, assuming you are using a belt grinder, my guess is that it likely has to do with your grinding technique. When grinding the primary edge bevels, most newer makers have the tendency to not "flatten out" enough once your grinding pass reaches the "belly" of the blade. Most of the time this results in essentially blunting and thickening the point. Another thing that often happens is that newer makers will tend to rotate the handle/tang end outward at the end of a grinding pass, which results in the same thing.
Of course there are number of things that could be happening, but based on my experience, that is my input.
I don't know how to explain it in print....it's more something that must be seen to be understood.