Certain users aren't showing up in /users when filter is applied

Question

NB: The filter parameter in v1.x of the API had a different meaning to the filter parameter in v2.0

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Consider the following query:

http://api.stackoverflow.com/1.1/users?filter=jon%20skeet

This yields the profile of Jon Skeet as expected. However, when attempting to retrieve the profile of another Stack Overflow user using the same method:

http://api.stackoverflow.com/1.1/users?filter=george%20edison

...I don't get any results even though I am most definitely a user on Stack Overflow and my username is "George Edison".

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Edit: It's happening again:

http://api.math.stackexchange.com/1.1/users?filter=george

...it's not finding me and I'm definitely on the site under the name "George Edison". Here is a screenshot of the above URL in Chrome:

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Edit: here is another example:

http://api.serverfault.com/1.1/users?filter=George

Returns:

{
  "total": 0,
  "page": 1,
  "pagesize": 30,
  "users": []
}

Answer 1

I can't reproduce this bug, both queries return what I'd expect (and variations work as well).