Zivush - 5:23 am on Oct 17, 2012 (gmt 0)

Using too many similar titles for pages, looks spammy. How do you expect them know/decide which page to send traffic to? So, in this case, they (Google) drop it all together.

KW Type1 and KW Type2

I have seen similar title structure in one high traffic sites that was heavily impacted by Penguin (lost ~50%). They used KW sample1 and KW sample1. It seems the owners have already changed these titles along other changes. Now, they put KW + [unique description] for each page's title to make it different from the rest.

on-page title (H1) and meta title .. both of these titles are exactly the same.

I think, this is not an issue. Many websites/blogs work exactly the same. Meaning H1 = Title tag.

You may want to change only the title tag for each page and leave the KW-type# as is, in order to give 'more strength' to the KW.