I'm guessing when someone (re?)wrote the stuff that goes on when one clicks the "Reply with Quote" button, they forgot to add the automatic removal of the q tag. Either that, or the q tag was introduced after the code for removing the quote tags was written, and so someone forgot to update the code.
I've only seen the [q] tag on Apolyton, so I'd guess that it was added on by the owners here, to make it so that you didn't have to type out 'quote' every time you wanted to quote something.
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