SQL Server 2000 Full Text Index running on Windows Server 2008

I have SQL Server 2000 SP4 running on Windows Server 2008, and I'm trying create a full text catalog that includes full text indexes on a few tables. The catalog has an Item Count of 53676, but a unique key count of only 8.

On another database (a Windows Server 2003 machine) with the exact same data, i have the ex开发者_开发知识库act same Full Text catalog set up and the unique key count is 75312.

What could cause the unique key count to be so low?

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Have you checked the minimum and maximum indexed word lengths are the same on both machines?