COD MW BR bug?not sure please help

is it a bug or is it just me?updated this game 2 weeks ago i think and the update was 12 gb, after the update 12gb used in my ssd, opened the game again today there was a 16gb update…guess what added 16gb again to my ssd…isnt it suppose to replace some files if updating?or is this normal?so in the near future if you will have more updates it will fill my ssd up?first time i encounter a game when updating it will fill up the disk space