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If you try to filter work log results using a JqlQuery by limiting the JqlResult to Issues containing a work log for a specific usersuser, than please consider, that the : The resulting list may contain work logs of other users as well. 

This is correct. Colloquial the questions has to be translated as follows: 

• give me all Issues where a work log exists, which belongs to user xy (Jql Query)
• give me all work logs for the issues from previous step
  • if you haven't applied the icTime user dropdown filter, you may see results of other users than xy as well