Google Analytics Goal Funnel from Home to Order

Hi,
I am trying to set up a goal funnel in Google Analytics starting from the main page to the order.
It works if the visitor completes the order. However, if he does not, he is immediately counted has EXITing the Home Page.

For instance, yesterday, out of 55 visitors:

I don't understand why the 5 visitors who went to a product page (/index.php?main_page=product_info&cPath=12&products_id=88 and /index.php?main_page=product_info&cPath=12&products_id=111) are not counted in the step 2 of the funnel "Product page".

Here is how I configured my goal:
A- Setup: I used the template called Checkout Complete
B- Goal Description: Destination
C- Goal Details:
Destination (Regular Expression): main_page=checkout_success
Value: On
Funnel: On
1- Home page: / (not required)
2- Product page: main_page=product_info
3- Review Shopping Cart: main_page=shopping_cart
4- Login/Create an Account: main_page=login
5- Review order: main_page=checkout&fecaction=null
6- Waiting page before Paypal: main_page=fec_confirmation&action=process

Thanks a lot in advance for your help.

If you are actually using ZenCart v1.3.8a still I suggest that you upgrade immediately on your schedule versus getting hacked and have to perform a clean and an upgrade

I know, I have just been putting it off because I am worried about breaking everything, addons, custom pages, languages... And I don't understand how to test it locally using Wamp. but that's another subject.

Any suggestions on the funnel though?

Sorry, I can't help with the goal funnel, but spending the time on upgrading to a secure version to prevent a hack may save you far more money and customer goodwill than tweaking SEO could gain... before the hack that could happen any time.