Why has my page rank gone down?
 

There may be some other factors that involve in your degradation in page rankings. Over modification can also harm the site. In my views if you are doing constantly do follow seo then it might also be happened because of it because Google may treat them as unnatural back link building strategy. Secondly your were doing seo as per your previous on page modifications and since you changed your site it may be harm your previous seo strategy. So try to check your on page seo from the beginning and then focus on off page seo.

Don't worry just creates quality of backlinks using quality of contents.So you can easily reached on top position.

I guess Penguin has got you .......

i suggest you to create quality back link in high pr sites.

it's probably Penguin - just continue creating quality backlinks and good content

May be because of Google update , your site rank be down.

it is nomal.

There are so many factors under the Page Rank. In my opinion, you are doing high-quality work, and get a good backlinks. Backlinks, you get good traffic and your page rank is to increase or maintain. Because the number of spam is created, so it has a direct impact on your page rank.

don't worry about this because it depend on quality content and quality of backlinks.