That has all indications of being a factory mistake for the engine and transmission VIN.
They set up for 123551 instead of 123561 and stamped a 5 instead of a 6 at that location.
Please post photos of the Dash VIN and the stamped VINs on the block and transmission so we can check it out.
Heck, post photos of all the VINs...Driver's Door VIN Decal, Fender Tag, Cowl and Radiator Support.
I would hope your Dash VIN, Fender Tag VIN, and the State Title all show the 123561 since the Dash VIN is everything!