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Thanks, The file has no out of bounds data, I usually expand or scrub the layer in all 4 directions when making the file. Hard to do now at this weight but a double-check can be done. I also select to boundary and "crop" to delete out-of-bound data.

I did export to a TIF to strip out any Photoshop specific information, then re-converted and overwrote the original PSD, but at this level, I don't know if there is inheritance with Tif due to layer information being supported in that of oldest image formats, but assumed no layer would squelch any inherited data. Tif convert did not help BTW.  I am looking into the other suggestions but deep in production for an exhibition this week. Still a mystery I intend to solve and record for others experiencing this.