You'll need to turn caching off on the module. If you go to the module settings for the module it probably has a value other than 0. When logged in with host/admin you won't get the cache issues.

Module caching is used to improve performance of DNN. There are a few things to keep in mind:

• module caching is only done for anonymous users
• the actual html output of the module is cached, which means that if the module gets displayed from cache, none of the module code will actually run
• you can denie module caching for modules that do not support it by changing the default cache time in module definitions for that module to -1
• you can also add a cachetime node to your dnn file (under the module node), and give that the value of -1, that way, dnn will never allow caching for that module. That would look something like this:
  
  ....
        <modules>
          <module>
            <friendlyname>MyModule</friendlyname>
            <cachetime>-1</cachetime>
            <controls>
  ....

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