Magento – Duplicate Orders

You are running the Microsoft IIS webserver, as IIS doesn't work with the .htaccess you need to active the url redirect to get it working, to do this open (or create) the web.config file in you webdirectory and insert this:

<rewrite> 
<rules> 
<rule name="Imported Rule 1” stopProcessing="true"> 
<match url=".*" ignoreCase="false" /> 
<conditions> 
<add input="{URL}" pattern="^/(media|skin|js)/" ignoreCase="false" negate="true" /> 
<add input="{REQUEST_FILENAME}" matchType="IsFile" ignoreCase="false" negate="true" /> 
<add input="{REQUEST_FILENAME}" matchType="IsDirectory" ignoreCase="false" negate="true" /> 
</conditions> 
<action type="Rewrite\" url="index.php" /> 
</rule> 
</rules> 
</rewrite>

I never tried using Magento with the IIS webserver, so maybe it is a better solution to use the Apache server on your windows machine, this way you can use the .htaccess files that comes with Magento.

First of all you shouldn't be using load in a loop. It's a really big performance killer. Use ->addAttributeToSelect('small_image') and after that use the $product object instead of $_productInCollection.
but if you really insist on using load use if as follows.

$_productInCollection = Mage::getModel('catalog/product')->load($product->entity_id);

if you use the same variable $obj for loading products you get issues like yours, because the objects are passed as reference.
So when you call $obj->load() the second time the variable $obj still contains the data from the first load and, and when calling load the data that is already set is merged with the new values from the database.
So...product 4 does not have an image, but $obj already has an image set from loading product 3. On merging you get the image from product 3.
[Edit]
And an other thing...a bit off topic. If you want only 26 products set a limit to the collection. Do not load the full collection and the just stop after 26 iterations. Again...big performance issue.

$collection->setPage(1, 26);
//or
$collection-getSelect()->limit(26);