Question Fortnite Very Dark - Computer Issue?

[DXXXX]

Hey, I know this isnt like a fortnite support or anything but I was playing fortnite on my pc the other day, keep in mind this wasnt happening like a week ago, everytime I go somewhere (this is what I think) where the sun isnt shining onto it, then it just becomes so dark.. For example - my builds (ingame). Anytime I make a box with my builds (of course theres no sun shining inside the box) my box just becomes so dark.

If you need anymore info i'll happily provide you.

Example pictures:

https://gyazo.com/fa382ba861231980590f71b410634dfb

https://gyazo.com/c8c81917095ebf0eb4204fbda6bf980a

Maybe I did something in the nvidia settings? I really dont know.. Thanks for any responses.

Specs:

Intel i5 2400
GTX 1050ti
8GB Ram
1TB Hdd
CX450 Psu
OptiPlex 390
0M5DCD Mobo

 

[Xbox And Windows gamer]

maybe a bad monitor?