I have some strange result while searching my domain like this: www.mydomainname.com my website is somewhere at the very end of results. And I think my website is the best result for such a query. My website is not banned, although there was some great losses in results couple months ago Have you ever experianced something like that? Do you know the reason?
You are saying that you search for your own domain in google - and it doesnt' come up first (or even close to first) in the serps? That does sound like your site is devalued (close to being banned). So if you are doing anything shady that might be interpreted as black-hat, make sure you stop doing that. Do keep building your site and trusted links to that site.
I've seen it before, generally it means a mention of your url on a higher PR, more trusted site. That query will bring up your homepage and anywhere your site is mentioned by url - for instance, mine brings up my listing at JoeAnt first, mostly because it is the highest PR page with www....com hyperlinked, even though I have a higher PR. But there are other reasons this could be happening - particularly so far down in the serps. If you will post the url, I might be able to find something specific.
Well, here it is: sex.blox.pl It's about sex but it has nothing to do with porno, it rather useful, funny, interesting information and links. The pop-up box (18+ question) may suggest it is the reason but if it's a spider trap than why the site is still indexed and spider visits it and update?
Entering your url into a server header checker shows a 302 redirect to /html. I don't know if you have control over that, but you should see if you cannot make that a 301... a site:sex.blox.pl search shows 2 pages the same, save the cache date and updates made in the 4 days between them. This is causing a duplicate content penalty. Also, do a cache:sex.blox.pl in Google. It redirects as well, and may cause further ranking problems. The popup is annoying, but seems to be java, so it should not be a problem. Still, it may deter visitors...