Migrating data via wxr

I’ve 2 blogs, one with 2.0.6, another with the latest 2.1..

my latest posts are located in the 2.0.6 version. i tried migrating it via db, and i had problems with it, so i decided to upgrade the 2.0.6 to 2.1 and use the WXR exporting function.

when i import the posts into the new 2.1 blog via WXR, every thing seems to be okay except for the displaying side. a single post will show 2-3 times in the index. however permalinks are all correct, and the post count is correct too.

How do i fix this?