Punctuation in Sudokus

[lowsuann12]

Hi, I have been seeing punctuation in squares in a lot of sudokus from today, like Anti XV and City, and I cannot remove the punctuation and I can't write over them either. The square is just fixed like a number hint. I think this might be a bug?

[lenzo]

Hi lowsuann, try to clean up the browser cache, please tell me if it works.

[lenzo]

Hello lowsuann, I found, and fixed, a bug. Please let me know if you still have problems with these variants.