Clicking and Cracking Noises while DJing

I am a beginner DJ and i recently bought the new Hercules Inpulse T7 Controller. I also use Serato DJ Pro. Maybe its important to mention, that I rip my songs with a Spotify Converter. Now my Problem: While I DJ, the songs that im playing make weird clicking and Cracking noises. My Levels on the controller and in Serato DJ Pro are normal and there is no Redlining. I also tested different cables: I started DJing with the RCA Output to RCA Input of my speakers. Then I bought a XLR to RCA Input Cable. But the Noises didnt disappear.

Could it be, that my songs are damaged through converting ? But whats also weird is that the songs sound perfectly fine when i play them outside of Serato DJ Pro, for example with the windows media player. Or maybe the Controller Outputs are not the best. I dont really know what to do next.

If somebody had the some problems (kinda) and could help me out, i would highly appreciate it!