I have no idea why this is happening, but everytime I open this specific file, it slows down to 78.0221%.
Most likely it is the (fairly new) “automatic tempo detection” that is causing the problem. See this post on GitHub for a workaround: Unable to import song at correct tempo if wrong tempo detected · Issue #6425 · audacity/audacity · GitHub
I don’t get a dialogue box to press Yes on, and when pressing Ctrl+Z it just deletes the audio.
Sorry, I didn’t mean that part.
- Set the timeline to “Minutes and Seconds” (Timeline - Audacity Manual)
- Set “Music Imports” to “Do Nothing” (Import / Export Preferences - Audacity Manual)
- Disable the “Time Signature Toolbar” (Time Signature Toolbar - Audacity Manual)
Then try importing and hopefully it will be imported without stretching.