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?

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