Different results on www2

SERPs different depending on how I search

[zgb999]

I get different SERPs on www2 depending on how I search.

Going to www2 or sj directly KEYWORD is No. 8 (on www it is still No. 1).

But when I checked KEYWORD with the Google Dance Tool it is No. 3. So I checked the query used by the Google Dance Tool which was
[www2.google.com...]

This query leads to a page without description and without addwords but the main thing that puzzles me is that the SERPS are different if I go to www2.google.com and then just enter KEYWORD.

Anybody else having this effect with your keywords?

[zgb999]

I checked the results again and it looks like there is an additional filter depending on the querry.

A standard query on www2 or sj brings 5 sites on top that are not listed by using the query
[www2.google.com...]

Those 5 sites are off topic but doing a search for
allinanchor: KEYWORD
also brings 4 out of those 5 sites as the first 4 SERPs. Those sites don't have KEYWORD anywhere in their source code and only seem to be ranked on top because of external links.

Does this make sense to anybody? I don't have this effect on www, just on sj and fi. On fi there even seems to be another filter as one of the sites that has a top ranking on sj (which hasn't that ranking on www) is missing on ei by using the query mentioned above.

Strange thing...