what's wrong with the old bills?
What was wrong with the 20 dollar bill all the other times a different person was put on the 20 dollar bill?
https://en.wikipedia.org/wiki/United_States_twenty-dollar_bill#Pre-Federal_Reserve_history
1861: A demand note with Lady Liberty holding a sword and shield on the front, and an abstract design on the back. The back is printed green.
1862: A note that is very similar, the first $20 United States note. The back is different, with several small variations extant.
1863: A gold certificate $20 note with an Eagle vignette on the face. The reverse has a $20 gold coin and various abstract elements. The back is orange.
1865: A national bank note with "The Battle of Lexington" and of "Pocahontas" in black, and a green border.
1869: A new United States note design with Alexander Hamilton on the left side of the front and Victory holding a shield and sword. The back design is green.
1875: As above, except with a different reverse.
1878: A silver certificate $20 note with a portrait of Stephen Decatur on the right side of the face. The back design is black.
1882: A new gold certificate with a portrait of James Garfield on the right of the face. The back is orange and features an eagle.
1882: A new national bank note. The front is similar, but the back is different and printed in brown.
1886: A new silver certificate $20 note with Daniel Manning on the center of the face.
1890: A treasury (coin) note with John Marshall on the left of the face. Two different backs exist: both with abstract designs.
1902: A new national bank note. The front design features Hugh McCulloch, and the back has a vignette of an allegorical America.
1905: A new gold certificate $20 note with George Washington on the center of the face. The back design is orange.
https://en.wikipedia.org/wiki/United_States_twenty-dollar_bill#Federal_Reserve_history
1914: Began as a large-sized note with a portrait of Grover Cleveland on the face, and, on the back, a steam locomotive and an automobile approaching from the left, and a steamship approaching from the right.
1918: A federal reserve bank note with Grover Cleveland on the front, and a back design similar to the 1914 Federal Reserve Note.
1928: Switched to a small-sized note with a portrait of Andrew Jackson on the face and the south view of the White House on the reverse. The banknote is redeemable in gold or silver (at the bearer's discretion) at any Federal Reserve Bank.