The way computers store and display characters is kind of grouped into groups (an artifact of how things have developed over the years). A special character in this case means anything not in the really ancient set of characters.
And it can be almost anything. Quotation marks for example have many different versions.. there's the basic version which looks like this: "", and then there's the special version which looks more like what you'd see in print: “ ”. Or apostrophes ‘ ’ vs ' '
Usually the characters come from someone copying and pasting from another website and the special characters are being used by the website. Even blank spaces can be special, hyphens, etc.
Firefox seems to be the only one affected, Chrome works ok or as you say browsers on mobile devices.
I plan to do a minor update to the forum software to see if it fixes the issue.
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