You have 'Snap' turned on (this is the default). Press the 'S' key to toggle it on and off. You can then zoom in and move the audio frame by frame.
Insanity is hereditary, you get it from your children
Message edited: Added 'zoom info'
Welcome to the forum.
Neale has given you the "trick," that you need. Just do not forget to hit the S key again, to toggle Snap back on, when you go to do other editing, or things will not work as before.