It seems that the 3rd aliyah in Bamidbar needlessly repeats the information given in the 1st and second aliyah
First Aliyah: Lists the leaders of each tribe
Second Aliyah: gives us the census information for each tribe
Third Aliyah: Describes the order the Tribes camped in.
However, the third aliyah also retells us the leader of each tribe as well as the population of each tribe. Don't we already know that information from the first two aliyahs?