Update:Moya's date was wrong. This is why those two entries disappeared. They were coming up in January 2001. This could have easily been solved if I had paid attention to the date on them, but I distinctly remember noting that the time and day were right and not bothering to parse the date on them (after all it would seem unlikely that an error would align the days of the week right while leaving the date off by over a year)....
However in my defense I will point out that the correct response for that error should have been that the second backdated entry (stuck in January 2001) should have pointed to my first entry in October 2001. For some reason that entry kept returning an error saying that there was no entry after it, so if you missed the fact that the date was wrong, you'd still be stuck with 2 entries that provided no way to reach other entries. That's what really threw me off. It looked like those two entries existed in their own little world. If the second entry had pointed me to my first entry ever, I would have probably figured out the problem....
Still though, I'm not feeling horribly bright at not having read the wrong dates.