You drag the edge of an audio clip and the result is not what you expected. Before trying again, name the operation you want: hide an unwanted edge, move the event in time or change its duration through speed adjustment.
Match the control to the intention
In the current Audacity clip documentation, trim and speed controls are distinct. Trimming retains hidden audio beyond the visible edge, while the speed controls change playback speed. Check the manual for your installed version because interface details can differ.
Do not infer the operation from the cursor movement alone. Look at the control label and the resulting clip state.
Try a small, reversible change
Work on a clearly named editing version. Make one change and immediately listen across the boundary. If speech has become hurried or the timing has shifted unexpectedly, undo and inspect the action you used.
Keep enough surrounding audio in playback to hear whether the edit fits the sentence. A clean-looking boundary can still interrupt a thought.
Record the reason
Write a brief note when the change affects meaning or timing. Our guide to editing interviews in context helps you evaluate that consequence. Knowing which operation occurred is the first step; deciding whether it serves the recording is the next.