Am I the only one?

Yes. I have a similar problem to yours. But, rather than not being able to submit, I need a shorter response.

I've been having that issue (but it also gets rid of my đường dẫn when I update it that way). I'm getting fed up with it.
I'm not sure if this is coincidence, but after a long time of trying to chỉnh sửa my profile, I switched back to English fanpop and was able to successfully chỉnh sửa it right away. Idk, are bạn sticking with just regular English Fanpop?

bạn have to shorten some of your responses like your yêu thích sách hoặc authors hoặc your yêu thích phim chiếu rạp hoặc song artists. After shortening these, it should allow bạn to đệ trình it. If this still doesn't work, refresh the page a couple of times. I had the exact same thing happen. Hope this helps!