Choppy sound already on preaview

[Hagi]

Hi everybody, I´m pretty new here and I have a very frustrating problem. I´m from germany and my english ist not tha best, so please be kind of my spelling. So I´v configured everything, and everything is working quite fine, except the sound from my DJ-System I want to stream. I think it has nothing to do with Streaming itself, because it´s the same when I only here the input-sound in OBS on Desktop-Audio for monitoring. It´s everytime a coppy sound (I hope thats the correct word) as you can here on my attachment. Also I dont think that my CPU is the Problem, because I dont start any Stream or recording and it shows that CPU is only 1% used. I´v only opend the OBS-Studio (28.0.3, 64bit) and preview the inserted sound from my Pioneer-DJ-System and it´s directly sounds so bad :( I´v really no Idea anymore why this is...let me know If you want to know any settings. I´v really glad to here any Ideas why this came from. Thanks!!!