I believe that the instance of the symbol on your artboard has been scaled up from its original size. When you enter edit mode you are editing the original symbol, at the size at which it was stored, rather than the scaled-up instance.
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I believe that the instance of the symbol on your artboard has been scaled up from its original size. When you enter edit mode you are editing the original symbol, at the size at which it was stored, rather than the scaled-up instance.