I re-read that one and noticed that Zoé (I think) is (not only rendered, but) stored as Zo? throughout the story...
Oh wow. I must have text-edited the file and replaced the accents. Or messed up the code. I'll fix it, thanks!
It looks like I broke it a little under a year ago, probably when I was reworking the story editor. Please let me know if you see any more. There may well be other accent marks that didn't make it through that change correctly.