What's wrong with my search function?

[xyd]

I understand that I use vB4 and vbulletin.org uses vB3, however something still feels different here.

I use the default search engine (not sphinx or anything).

First image is settings on this forum.

Second image is settings on my forum.

Third image is results on this forum.

Forth image is results on my forum.

Notice how the results on this forum are sorted properly (by last post date), however mine aren't.

Any ideas?

Thanks.