I encountered an issue, that I can't figure out. In a simplified form: I have an audio track, I perform some volume adjustments, other basic settings, add a gain effect. It all sounds good in the playback. I export it, and then it gets some weird echo. I threw the exported track into my project, and you can see that the bottom waveform is clearly shifted in comparison to the original one (on the top).
I'm completely puzzled about this. Is there some hidden switch that I flipped? How can I better investigate why this is happening?