(a)      If an instrument was recorded before January 1, 1973, any failure of the instrument to comply with the formal requisites listed in this section has no effect, unless the defect was challenged in a judicial proceeding commenced by July 1, 1973.

      (b)      If an instrument is recorded on or after January 1, 1973, whether or not the instrument is executed on or after that date, any failure to comply with the formal requisites listed in this section has no effect unless it is challenged in a judicial proceeding commenced within six months after it is recorded.

      (c)      For the purposes of this section, the failures in the formal requisites of an instrument are:

            (1)      A defective acknowledgment;

            (2)      A failure to attach any clerk's certificate;

            (3)      An omission of a notary seal or other seal;

            (4)      A lack of or improper acknowledgment or affidavit of consideration, agency, or disbursement; or

            (5)      An omission of an attestation.