Charset problem

Hi, I have such strange problem with editorials - in all my browsers (FF12, Chrome21, IE9) I have problem with some special characters, see pictures:

But when I try to edit editorial it’s ok

Any idea where is the problem? Detected charset is ok - utf-8.

I think you need to contact codechef about this. In a previous version of my answer I added some special symbols, including the sum symbol. These remained perfect on my machine, even after posting. When I looked at my answer from a different machine today, the symbols were replaced by question marks, even when I edited the answer.