Was the half tribe of Manasseh given land twice in the book of Numbers?

I'm going thru Numbers and maybe I missed something. Numbers 32:33-39 mentions Moses giving land to the Gadites, Reubenites and the half-tribe of Manasseh. Later in Numbers 34:17-29 , it names one leader from each tribe to help assign land to the "remaining" tribes. The tribes of Reuben and Gad aren't in the list understandably because they got their share in Numbers 32 but Manasseh is in the list. (v 23) . Why is Manasseh listed twice to receive land? Did I miss something important in an earlier passage or did I misunderstand something that happened in the history of the Israelites exodus? Am I misunderstanding what "half-tribe" means?