I worked as TL before, even though it was only about 20,000 lines I translated and did it for free. Essentially, most translators virtually have no access to the game whatsoever, making it extremely difficult to cope with certain lines if they use some context like the location you're at. Without knowing that this specific line was in Tifa's bar and that there is no second floor of that bar, it's very easy to make an error there. That sort of thing happens a lot nowadays, but there's almost always someone poor guy in charge of checking those things now and fixing them if they dont make any sense. That wasn't the case back in 199x