New pages indexed then deindexed?

Hi, guys
19 days ago I started a new website using wordpress. My plan is to build it into an autority website in its niche. I am not ranking for anything atm because I have not been backlinking as of yet!
Only manualy bookmark every new article I post to about 10 bookmarking websites I have a personal account with.
I have made a facebook fan page for this website and have liked every article.
I dropped about 30 tweets with links to my website withing the 19 day span on my account.
I have done 20 manualy directory subbmissions and about the same number of blogg comments.

Now to my problem
Google would index my new pages and categories in about 4-6 hours. For the last 2 articles and category I added it was the same!
Today after I came from work. I Checked my website and google has deindexed my 2 last added articles and last added category.
I dont know what the problem is there are no broken links on my website because I have a plugin for that.
I am submitted to google webmaster tools with this website and havnt gotten any warnings. But GWB is a couple of days behind with stuff like that.
I bought the content. Havnt checked copyscape but I bought it from a reliable content seller here on BHW.
I dont know what to do!?! This was a longterm project for me so I would be a sad panda if it would fail in its first month.
I would love if someone could guide me in the right direction to solve this issue!

ty in advance best regards,

I have a decently large site 85+ pages and Google indexes / de-indexes pages at random. This applies whether or not I backlink or not... It's very strange... I think it's just a bug in their algorithm. The longer the page is up I think it will stick after a while. I also notice pages with backlinks tend to stay indexed longer.