After clicking the X it just stays in the same position but in your file it goes back to the correct position. (it's been a great tutorial so far btw)
Hi, I'm glad you're liking it so far! I have a strip in the NLA editor underneath, so when I hit the X it defaults back to that. If you don't have any strips then it won't have anything to revert back to. Let me know if that's the case!