I keep hearing this unusual noise on my music?

Alright so i'm producing hip hop beats on FL studio 9.0 and when I get the drum layer by itself on the background I hear a crinkling kind of noise. Like paper being crumbled. Then I add strings and it gets even louder! I've had this for a while now and it's not allowing me to put my b AT ALL because the crinkling noise will just cover the whole song. The one thing that happens is when I am completely done with the song and render the file to an mp3/wav it just completely goes away. Idk why please help me though!