Garbled text can be caused by incorrect text encoding, font issues, or corrupted files. To fix it, try adjusting the text encoding settings in your browser or application, updating your fonts, or using a different program to open the file.

Sarbjit Kaur is right. I would personally recommend copying the text from the original source and pasting it into a plain text editor (such as Notepad or Sublime Text 3). Once you've pasted it, you should select that text again, copy it and paste it onto the final destination. Don't save the file, because that's gonna encode in a certain way.