Because it's such a security risk, users are normally not allowed to post HTML in sigs or anywhere else. You can change that in permissions, but it's really not recommended. Presumably you're the admin, so when you do it, it works.
You could, in theory, go through the old db and translate all the HTML to bbcode, but that would be painful. Just forget it. Who really cares if old archived posts show unparsed html?
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