Can you describe what you mean a little more about 'distorted'? We can't reporduce any issues in the Usermap when going to the last page or setting the limit to something like 100.
Also, can you try changing the filtering to things are ordered differently? Then, check if it's simply something strange with the last user in the list or if it's something with a specific user that only shows up based on specific ordering.
Thanks,
Alex