Bootcamp windows no space.

Hello,

When I go on "about this Mac", "storage" on bootcamp disc it says there's about 10 gb of free space. When I restart on bootcamp and go to "this pc" to see how much of free space I have, it says 600 mb or something similar. I haven't downloaded anything on windows mode except from a program thats 13.2 mb and its from a very trusted source (there is no hidden files that could be downloaded with it).

What can I do? What is happening?

Thank you.