Very wierd result in serp with a 2 word search

I get my site on 1. with a 25 line description

[zeus]

I just looked through my logs and I found search word which Im usualy not found under, then I got to yahoos site typed the search word and Im no.1 out of 4mill. with a halv page description and other words combine, like 25 lines of text, but if I type the link which is 5 lines I return to Yahoo.com , but it says mydoman.com

zeus

[manufactu]

I get wierd results with my web site in Yahoo! every day. Whenever I track it down it is never in the same place.

[zeus]

No thats not whats wrong,

A normal serp results is:

The Title here
Here a description of what the site is about

My search

Is my domanname with more text about 4 lines
then 20 lines down of description it fills up half of the site for that search.

zeus