Heather -
Your chapter needs two easy changes:
1) The silence before you start reading should never be longer than 1 second (around half a second is ideal). I measure just over 5.1 seconds of opening silence, so you should trim off about 4 1/2 seconds from the very start of the chapter.
2) The silence after your last word should be at least 5 seconds. (Up to 10 seconds of ending silence is allowed in LibriVox recordings, but it's quite rare for any readers to include that much.) I'm seeing slightly less than 4.2 seconds of silence at the end of your chapter. Please add around a second of silence to the end of your chapter. It's possible to tell Audacity to generate mathematically-perfect silence, but a better way is to copy something like 0.8 to 1.0 second from the closing silence and pasting that onto the very end of the recording. That will be "room tone" - the background noise as picked up in your recording location.
Your recording of the story itself is nicely done and well within all the technical specs (thank you). Once you make the edits to the ends of the chapter and upload again all should be right with the world.
Mr. Fox is a bit of a trickster, isn't he!