When you edit a post, special characters are replaced with HTML entities. These are not re-parsed when you save the edit.
So for example, say I post this:
[quote]"I am a test. 'A test,' I say!"[/quote]
When I go to edit it, I will see the following in the textbox:
[quote]"I am a test. 'A test,' I say!"[/quote]
And the post will display like that when I save it. If I then go to edit it again, the problem stacks:
[quote]"I am a test. 'A test,' I say!"[/quote]
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Yes I have been having problems with this as well. Thanks for making this thread. I believe it appears for words that are "quoted" and using apostrophes; You're, they're etc. There are probably other symbols as well.