Checked my keywords on serpbook and I am seeing them jumping around from position 15-100 sometimes also to nowhere since a few days. Then I checked ahrefs and saw someone build backlinks to my website. About 1.2k backlinks with natural anchor text (no cheap viagra or only one anchor). Before all my keywords were in the Top 20. Most of them between #10-14. Now they are between #25-35 and changing everyday. In your opinion, do you think its just a google dance or did these backlinks (obviously made with gsa ser) have a bad effect?