This happens after using 3.4.1 for < 15 mins. Reverting, saving, exiting, and reopening fixes it for a short time.
Bug Report: Applying noise reduction to a clip repositions the clip right.
Create vocal clip, normalize loudness.
Highlight clip and apply noise reduction. Clip will be moved right and appears corrupt.
Exit Audacity 3.4.1, reopen project, highlight same clip and apply noise reduction. Correct result (noise reduced, clip stays in same place) will occur.