Originally Posted by Smeklinis

Got it.
There exists some kind of google penalty, but from my experience in that case should be 2 to 10 results on google. I got that penalty 3 times.
And i assume your site has much more pages than 15.

I will move to a new domain. Register something similar to current domain - to match your existing backlinks anchors.

I do not know i can post link of another forum here - if not - admins can remove it.
You can read about that penalty here: https://www.blackhatworld.com/seo/an...y-now.1318746/

As i told, not always should be 4 results exactly on this penalty.