Major Error Hundred Dollar U.S Bill

I have 3 hundred dollar U.S bills in sequence, and the middle one has an obvious error; not sure of it was error with cut, print or placement.
They are the 1996 series, but I don't understand what the small numbers mean: the two normal ones says "B2", but the error one says "G1". What does that mean??
Not only is the error one being cut wrong, it's whole bottom is cut off with too much space on top; the green stamp and the serial numbers are flipped both vertically and horizontally.
I remember seeing on the news that the U.S government was looking for 2 hundred dollar bills with major error with them that were leaked out by mistake. I believe this is one of them.
I can provide a picture if anyone asks for it.