I used to do this in Audition after making 6 dB jumps up or down with the V3 on occasion. I found I had to zoom WAY in to find the precise point at which the jump occurred. If you made a +6 dB adjustment while recording, and applied amplification to the waveform prior and up to the gain change, and <a> the recording drops down and then back up, you need to extend the gain change further forward in time; and <b> the recording amps up then back down, you need to draw the gain change back in time as you've overlapped with the gain change implemented during recording. Not sure that describes it very well, but...there it is.
Once you have the adjustment made precisely at the time of the gain change, you may still have artifacts as a result. IME, one way to minimize or reduce the artifacts: apply the post production gain change to the zero crossing nearest the original gain change.
If you've made gradual gain changes rather than stepped, I've used a volume envelope to apply a gradual post production gain change to resolve the problem.