eCart checkout redirect fails if not logged in before ordering

Hi. Our website eCart has an interesting hiccup. If a user is not logged in when placing items into a cart, then upon checkout, they are redirected to a log-in page, which is fine. BUT when then trying to checkout, the website returns an empty cart. This does NOT happen when a user is already logged in before adding items to a cart.

How do i avoid the empty cart scenario with users who log in after adding items to their cart?

Can I get a url and a username/password so I can reproduce the problem... also maybe a copy of the login page.

Sure.

I can't for the life of me figure out how to add something to the cart. What page is that done on?

Sorry. I'm still styling some of the cart. Also, due to the nature of the business, you have to chose a shirt AND a design before you can add them to the cart:

Click order now in the top right, then chose option A
Choose any apparel category, then a type (Short sleeve, then 50/50 tee for example)
Enter a number into any size box (at least 12) then click submit at the bottom.
Click the words that say "Click here to add your first design"
Choose a design category/design, then choose two ink colors in the colorizer. Click "Select these colors"
Select full front and click submit. Dont worry about anything else on that page.
Finally, click "add to cart". It will (annoyingly) be on the right hand side, between the apparel and the design. This will take you to the cart.

OK this is because your redirect is taking you from: http://www.yoursite.com to https://yoursite.com.

Sites with and without the "www." function as separate sites.

The solution is to add a .htaccess file to either force it to always or never use www. so it stays consistent.

Try this in a .htaccess file:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.example\.com [NC]
RewriteRule ^(.*)$ http://example.com/$1 [L,R=301]

replacing example.com with your domain

Fantastic! Seems to fix the issue completely! Thanks so much.