because the 56 Th are not pro. They are normal.
There are Pro versions with 56 TH.
they are probably 53TH and they reach 56 TH, 50Th pro are 1975w, 53TH 2094w and then 56TH at 2560w. So they are not pro. Pro are only 50 and 53TH
some where some place I posted screen shots of them.