Because they are two different events the second of which is almost unknown in the West. The Warsaw uprising of 1944 involved 50,000 of Polish Home Army troops, led to the liberation of the Polish capital for two months and ended in the destruction of the city as expected help from the Soviet Army did not materialize.
Uh, wait a second there.
An examination of American newspapers and magazines from 1944 show that indeed the uprising of that year was covered, and publicized--and that there was much resentment that the Soviets did not hurry to Warsaw, to help.
On the other hand, the uprising of 1943 was barely known of at the time, and not in the newspapers and magazines at all.