Problem with images in blog posts

I am having a problem with the images I insert into my blog posts. They either don’t show up at all, or they show up in the wrong place, or they show up in the right place, but the text in the post is doubled. Someone advised me that this might be because my index.php template file appears to be using <?php the_excerpt();?> instead of <?php the_content();?> in its template files, and that the solution would be to edit the file and replace <?php the_excerpt();?> with <?php the_content();?>. This would be easy, except I looked and cannot find <?php the_excerpt();?> OR <?php the_content();?> in my index.php file anywhere.

Attached is a link to my index.php template file on pasteboard. Could someone look it over and tell me if they see a problem? I have a pretty basic knowledge of wordpress, and the code still puzzles me.

http://pastebin.com/BBUUmKdw