BUG #13324: Database returing incorrect results on querying slect clause

The following bug has been logged on the website:

Bug reference:      13324
Logged by:          Krishna Sharma
Email address:      ksharma6@metlife.com
PostgreSQL version: Unsupported/Unknown
Operating system:   Windows 2003
Description:

Hi PostgreSQL team, we are suing PostGreSQL 8.2.

When I run a query in database like
select * from dn_case where id= 1234.

it returns 2 rows with different ids.

How is this happening?

it seems the database is corrupt. Please suggest a soluton for this issue.