Setting the volume of the channel at a lower level while recording might be the cause of the disturbance you are facing. You wanna keep -18 dB as the signal level while mixing and avoid near 0 bd while recording. Following this would give you better results.
If that doesn’t work then you might wanna try a different software for this purpose. I am presently using Audacity for windows until I figure out a way to run Garageband on windows. I already tried some online solutions but haven’t gotten any success yet. Any suggestions would be helpful