Twice? By whom? Do you know why he doubted the original ordination (I presume it was by a Novus Ordo bishop) and the first conditional ordination?
I believe his conditional ordinations were by Bishop Fellay and Bishop Slupski.
Bishop Fellay (and/or the SSPX) wouldn't give him any docuмent or proof of any kind that he had been conditionally ordained, so he basically had no choice but to go through conditional ordination again. The whole point of conditional ordination is to remove doubt in the minds of the Faithful.