It's actually not double jeopardy but an argument can be made that it violates the United States' and Michigan's Ex Post Facto clause.
That argument however has failed numerous times in Michigan. There are 3 leading cases - one out of the western district of Michigan (federal) and two out of the Court of Appeals. Believe Doe v Kelly is the federal case.
All three cases say registration is not a "punishment" so there is no violation of the Ex Post Facto clause.
An Attorney-Client relationship has not been established. Becket J. Jones is not your attorney.