While my electric bass is connected to a mixer Mackie 402 VLZ4 and I am not touching the bass or just holding in my hands the broom sound is heard in monitors. The feedback stops when I am touching the strings while holding it or not. Is the bass faulty? Is it missing anything? Please, help me guys

 

The noise stops when you touch the strings because you essentially becomes the ground. What that means is that you might have a problem in your outlet, PC and/or interface. I would start by changing USB ports (try ports that are more distant to the one you're using), then I would move into checking if the outlets are grounded. If the bass cable you're using is low quality that might also contribute to the issue, but if it's a proper 1/4 inch cable for guitar I doubt it have any issues, but trying another cable doesn't hurt.