Star Trek Discontinuity: The ST:V Turbo Shaft

In Star Trek V the Final Frontier, Kirk Spock, and McCoy shoot up a turbo shaft. As they shoot up this shaft we can clearly see signs labeling the decks, increasing in number from bottom to top, with the top deck of the turbo shaft being labeled as deck 78. There are two major problems with this. First of all, the Enterprise does not have 78 decks; it has 23. The second problem is that the numbers are labeled in the wrong direction; on a starship the decks are labeled in ascending order from the top to the bottom of the ship.
However in the Star Trek V turbo shaft, the numbers are labeled in descending order from the top of the shaft to the bottom. So why is this? In the universe of Star Trek there really is no good explanation. Many other people have tried and, frankly, they all sound nonsensical, and I probably won’t be able to offer a more plausible explanation, but I’ll try anyway. The Enterprise A was refitted quickly from another Constitution class Starship, probably received a large amount of upgrades in a very short amount of time, which accounts for why half of the ship wasn’t in working order at the start of the movie. The labels in the turbo shaft are just another manifestation of this. In their haste, the two-bit technicians who probably controlled or programmed the machine that labeled the turbo shaft mislabeled it.