It may be a rolled edge, i.e, an edge that has been over honed and is now to thin.

I would suggest killing the edge and going back to a 4K then up to an 8K then test shave off of the 8K.
That will give you an answer.

While you are doing this look to see that the water on the hone is flowing in front of the edge and not under it. If it is going under the edge then consider what Euclid has posted.

Just my 2˘