Usually I think it's the result of a copy/paste of formatted text from another source, where the formatting is incompatible with regard to certain symbols and punctuation marks... so things like apostrophes don't copy/paste as simple text and get turned into ***8217 or something similar when the forum software tries to reproduce them. There was also an issue here with Cyrillic alphabet characters a while back IIRC, but I don't know if that's still the case.
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