Mystery Sound?

When i upload a music to Audiacity the music changes and random signal sounds appears every music this happens pls help me.

What do you mean by “upload”?

Are you opening files (WAV or MP3, etc.)?

Or, are you recording? If you are recording, what are you recording from? Any other details about your recording hardware or how you are configured may be helpful.

I am opening a mp3 file.

The files are probably not actually MP3 format, but some other format.
What does this site say the format is?