Hi guys, So I wrote a few articles for my website last week and did my best optimizing the keywords. I am using serpbook to track my rankings of the keywords in google. The keywords ranked in the top 40 last week and now they are slowly dropping off. What I mean is they bounced around in between 30 and 40 then totally dropped off throughout the week. Like -250 spots in google. I have done no SEO and these have been all natural rankings. Is this a common occurence or could my articles be over optimized therefore receiving a penalty? Thanks for the help in advance!