Halo Wars 2 taking up 65 Gigabytes without update

Hello, last month’s update wouldn’t start installing properly, so I restarted my xbox and it tries redownloading the whole game. Now i’ve tried a few things and it still shows a copy of the game installed on my both the internal and external HDD, no matter if I try to delete it.

With the update for the Flood DLC it would take up more than a whopping 80 GB in total! Anyone experienced the same problem, and know how to fix it? Thanks.