PyYAML yaml.load() appears to be alphabetizing input

I am having a frustrating issue with using PyYAML. I am loading the
following yaml file with yaml.load()

----- Begin pref.yaml -------

hellanzb-pass: changeme
hellanzb-host: localhost

newzbin-interval: 8
tvrage-interval: 300

# Your news server's retention in days
retention: 110

sets:
  - shows:
      - Some TV Show
      - Another TV Show
      - "This Show: Quoted because it had a colon"
      - Super Awesome Rodent Masters
    timezone: US/Eastern
    rules:
      min-megs: 100
      max-megs: 805
      groups:
        - alt.binaries.tv
        - alt.binaries.multimedia

---- End pref.yaml ------

However after I yaml.load() it and then yaml.dump() it to a new file
the following occurs:

----- Begin newpref.yaml -----

hellanzb-host: localhost
hellanzb-pass: changeme
newzbin-interval: 8
retention: 110
sets:
-   rules:
        groups:
        - alt.binaries.tv
        - alt.binaries.multimedia
        - alt.binaries.multimedia.cartoons
        - alt.binaries.multimedia.late-night-talkshows
        max-megs: 805
        min-megs: 100
        query:
    shows:
      - Some TV Show
      - Another TV Show
      - "This Show: Quoted because it had a colon"
      - Super Awesome Rodent Masters
    timezone: US/Eastern
tvrage-interval: 300

----- End newpref.yaml -----

Why does it jumble things around?

Here is how I am loading the yaml file:

stream = file(configfile, 'r')
config = yaml.load(stream)

I have also tried:

with open(configfile, 'r') as configuration:
    config = yaml.load(configuration)

What am I missing?

Thanks!

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