Halo 5 update at 446%???? What the????

My system has been updating for about a week now…I don’t know why…it is killing my data as it has burned through about 11 gb. At 446% I would say the origial file size would have been around 2gb? I can’t play my game. I have already played through the campaign so I know the game file itself is Ok and I have a hardcopy. My game was not a download. What is going on here?