bayowulf It looks like your answer has a directional quote in it but the original text has a normal quote. If you look closely, you can see that the quote is slanted in your answer but not in the original text:
Cβera
C'era
This is a bug, and I've put fixing it on the todo list π
In the meantime, you can use the "Pretend answer was correct" button to have the system count your answer as correct:

Thanks for letting me know, and sorry for the trouble!