hold on, I misread the plaques, the reason for the discrepency is infact soviet propeganda, which was not included in the western death tolls in the first place.
"Communist Polish and Soviet authorities maintained a figure "between 2.5 and 4 million",[53] and the Auschwitz State Museum itself displayed a figure of 4 million killed, but "[f]ew (if any) historians ever believed the Museum's four million figure".[54] Raul Hilberg's 1961 work The Destruction of the European Jews estimated the number killed at 1,000,000, and Gerald Reitlinger's 1968 book The Final Solution described the Soviet figures as "ridiculous", and estimated the number killed at "800,000 to 900,000".[55] A larger study started later by Franciszek Piper used timetables of train arrivals combined with deportation records to calculate 960,000 Jewish deaths and 140,000-150,000 ethnic Polish victims, along with 23,000 Roma and Sinti,[56] a figure that has met with significant agreement from other scholars.[57]
After the collapse of the Communist government in 1989, the plaque at Auschwitz State Museum was removed and the official death toll given as 1.1 million. Holocaust deniers have attempted to use this change as propaganda, in the words of the Nizkor Project:
Deniers often use the 'Four Million Variant' as a stepping stone to leap from an apparent contradiction to the idea that the Holocaust was a hoax, again perpetrated by a conspiracy. They hope to discredit historians by making them seem inconsistent. If they can't keep their numbers straight, their reasoning goes, how can we say that their evidence for the Holocaust is credible? One must wonder which historians they speak of, as most have been remarkably consistent in their estimates of a million or so dead... Few (if any) historians ever believed the Museum's four million figure, having arrived at their own estimates independently. The museum's inflated figures were never part of the estimated five to six million Jews killed in the Holocaust, so there is no need to revise this figure.[54]"