Unless your governing documents contain what I would expect to be a very unusual provision, i.e. that revisions to the Constitution are not effective until posted on your organization’s website, I see no reason why the revisions adopted by the members would not be effective now, without regard to what you may – or may not – have published on the website.

Normally revisions are effective when enacted unless some later effective date is specified in the approval.  Without that type language in the approval and absent some general provision that things are not effective until published, I would think the board should operate under the rules that were approved by the members.  Obviously, the new version should be posed to avoid the question in the future, but things done in the past two years according to the revised version should be effective.