I created a trailer gallery page with regular wordpress loop but there are some strange problems.

If you can look line 22 at my template's codes you will see showposts=16 parameter to just show 16 post per page.

But now it's showing first gallery page with 14 post (14 item) second page will be showing 16, then next showing something different.

So there are a problem which i can't solve. How i can solve this problem?