Getting a prime engram fixed the problem for me. did 3 milestone all dropping at 1 light higher which i disassembled for cores then got a prime that dropped at a normal amount of boost about 5 light higher. Ever since the rest of my milestones have been dropping higher like they were supposed to so i tested on another character did 2 milestones getting 651 drops from both then grinded out a prime and did another one and they started dropping 3 to 5 light higher from then on. The milestone i tested was nightfall 100k and flashpoint/ heroic adventure. Then the one after the prime was crucible daily and strike daily both dropping 653 and 654. Dont know if anyone else has experienced it