Asus rog strix scar 15 (G533qs) Shadow drive space shrinking and extending

[Gzrest]

My Shadow drive which is 823gb keeps shrinking in size and currently isnt updating the space on anything i put in it rather, the space gets taken off my OS (C:) drive then the space on my shadow drive gets halved to about 300gb what do i do? im supposedly supposed to have 2tb of space
I also found out theres a virtual drive of my shadow drive in my (:C) drive how do i stop the excess storage consumption.