We’ve all been there. You just finished recording what you thought was the perfect take—great energy, flawless pitch, solid delivery. Then you play it back.
If you apply noise reduction to a vocal track, then render it (bounce it), then import that rendered track into a new project and apply more noise reduction... your audio will turn into mushy, warbled garbage.
Most plugins have a "Delta" or "Listen" button. Press this. You will hear only the noise being removed. If you hear bits of voice or reverb tails in there, your settings are too aggressive.