How the update works ?? downloading the whole game every game update

Hi Everybody,

I have updated battlefield 6 lots of times including today, in each update my game requires to download the whole game as it seems, every section like multiplayer texture, singleplayer and thus are redownloaded again though i don't really mind about the  redownloading the singleplayer as I have played some of it already. In other games that am having when I am updating a dlc for example, it looks like an extention is added (downloading addtional files). but here is seems to redownload the whole thing

can someone explain to me how this work, or is it a problem with my system ?

Thank you