Problems loading images into posts

For some reason the uploaded images in my posts change in their functioning. My first post images operate as I want: clicking on the image brings up an enlarged image. My later post images won’t do this; double-clicking brings up the comment window. I can’t get just an enlarged image. I have noticed the html associated the images if different. I don’t think I did anything different.
Any ideas what I am doing wrong? It can be seen at: The first two posts are correct. I attach the code if it means anything:
<a href=“”><img class=“aligncenter size-medium wp-image-8” title=“MAP0047” src=“” alt=“” width=“300” height=“237” /></a>
<a href=“” rel=“attachment wp-att-34”><img class=“aligncenter size-medium wp-image-34” title=“MAP0020” src=“” alt=“” width=“400” height=“341” /></a>