Why would the anchor force for a single propped or anchored bulkhead be greater than the maximum shear?
Any concentrated force on a beam — and this is what you’re basically dealing with with a sheet pile — creates a discontinuity in the shear diagram equal to the magnitude of the concentrated load. Thus, the difference between the two shear values immediately on either side of the support will equal the magnitude of the support load. Inspection of the shear force diagram will show that this is so.
