index doesn't contain duplicates

All,

I have an table that has duplicate values for a column. I have a non-unique 
index on this column. When I run a query that uses a fast full scan to retrieve 
the rows, it only retrieves one of the two rows. When I force a full tablescan 
both of the rows come back. I have used all my sql tricks to try my best to 
determine if the value has trailining or leading non-printable characters and 
it doesn't appear so. I have also moved the values into a varchar 11 field in 
another table, the value is 11 chars long. Both of the duplicate rows where 
accepted. Does anyone know of a bug or a reason why both of the rows wouldn't 
appear in the index?

Thanks for your time,
Josh C.

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