So, I think I might know why that happens to you. If this is wrong, at least it's one more thing to look out for. Let's say you have an annotation running from 4:49 to 4:59 but you actually want two more seconds--to 5:01. Also, let's say your video ends at 5:15. The problem is, you can't manually change the 4:59 to 5:01 in one click (and good luck dragging perfectly). Whichever number you change first, you are creating a YouTube Paradox: 4:49 to 5:49 (doesn't exist) or 4:49 to 4:01 (can't exist). So YouTube will change the initial annotation to make sense of the world.
I'm not one of these people who complains about every annoying YouTube thing because overall all the platform is great and easy to use. But this one--man, it infuriates me.
