Hi.
I'm doing a SEO project for a danish jobboard, their primary keyword is job and I have managed to place the site as #1 a couple of times on google.dk (world-wide search).

My question is; when my site is not #1 I'm usually in the top 5 and my biggest competitor is #1, but when I'm #1 my competitor is not in the top 5. How can that be? How can the SERP be so different?