That does not happen with Squirrelcart generated links. If you follow the steps you provided, and then mouse over any link generated by Squirrelcart you'll see they all use a regular http:// URL, with the exception of links that are supposed to be secure.
The custom links you've added at the top of the page are using relative links. If you want them to always use a non secure URL, you would need to change them to use absolute URLs.
Your best bet if those links are on a page that is parsed by PHP is to use our SC_STORE_DIR_HTTP constant to precede those URLs. Printing the value of that constant will always print the regular non secure URL to the directory containing your storefront page (and your squirrelcart directory). So, if you have a file named "about-us.html" at the same level as your storefront page, you could link to it like this:
PHP Code:
<a href="<?php print SC_STORE_DIR_HTTP ?>/about-us.html">about us</a>
Alternatively, you could just use your domain name. If you do however, and decide to change your domain name OR the directory you are using for Squirrelcart the code would need to be altered:
PHP Code:
<a href="http://www.example.com/about-us.html">about us</a>