[V8i] GeoJPG not quite in the right place?

I have a survey (INHP-EF), and I have a georeferenced JPG file (GCS EPSG:3857). They aren't QUITE on top of each other. The image is "north" a couple of feet.

Is this possibly some sort of unit mix-up?

Or is it more likely that whatever datum the surveyors used is slightly off from whatever is governing the image?

What else can I do to check that everything is coming in exactly where it is supposed to?

My engineer is asking me why they don't match up exactly and I might be losing hair.

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