Orphix prisma dual decurions not getting xp

[(XBOX)LonelyRanker]

so basically I've done orphix alot but I always close my game after about 2 runs to go make some food, and I've noticed my dual decurions xp doesnt save,  like it saves, but once I close out of the game my gun goes back to unranked, so the highest I've gotten it was level 27 but now its back to 0 for example, and thats happened every single time I've logged out, im about to just grind it up to 30 in a archwing mission instead and I dont know if all archguns are like that or if its just till its lv 30 it'll reset when I log out, but so far its the only gun I've had do this and its only on orphix missions