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I believe my lapping plate and my technique are both ok. I don't get this bulge-pattern on my GlassStones.

I let the Naniwa dry out for a day and now it has a slight hollow in the middle where...

I've lapped it and honed razors on it several times. Based on the amount of use I would have expected only a small bit hollowing in the middle.

Oddly it has shown this bulge pattern before when...

The photo below is of a Naniwa 10k that has been lapped for just a few seconds with a DMT plate. What causes this bulge in the middle (that the DMT is shearing off)? I have lapped this stone before...