I see the following possibilities:

1. Internal filters at your company. I doubt that.
2. Your company always get results from a local or special data center. Have you used domain and IP tools to check the Ip you are on? Have you asked people in the same building / street, but on another IP to do the same search?
3. Geo location problems. How far out from your location do you have to go to get more "natural" results?

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