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 リンク 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 編集 my profile, I switched back to English ファンポップ and was able to successfully 編集 it right away. Idk, are あなた sticking with just regular English Fanpop?

あなた have to shorten some of your responses like your お気に入り 本 または authors または your お気に入り 映画 または song artists. After shortening these, it should allow あなた to 提出する it. If this still doesn't work, refresh the page a couple of times. I had the exact same thing happen. Hope this helps!