Forum:ME3 missing clusters on map

i'm new to the forum and mass effect in general.

i have missions listed in my journal such as Benning: Evidence, Irune: Book of Plenix, and N7: Cerberus Abductions to name a few, but i can't find the relevant clusters (mission locations) on my galaxy map.

i've played though ME2 without this kind of problem so idk if they somehow unlock later, but why would i be able to get the missions listed in my journal if i unlock the clusters later. am i glitched or am i worried for nothing? i play xbox360.