Link problem

[healthcabin]

Hi all,
This is my first post here, I usually search for my answers, but can't seem to find an answer to this one.

I have heavly custimized my zencart and really for the first time am having a serious problem. For some reason on the shopping_cart page when I click check out the page goes straight back to the login page. The link shows it's supposed to go to checkout_shipping. Not sure what's wrong.

I do want to add in some background here in case it helps. We originally were using Godaddy, but they wouldn't open the Linkpoint port for us. So we moved to Bluehost. We had most of the site setup over there including the SSL certificate.

I wondered if this has something to do with it. Something with the HTTPS configuration possibly?

If I don't have enough information here, please let me know and thanks in advance for the help.

http://www.plopproductions.com/Henrys_Place

I am a new zencart user. I currently have the simliar problems. I have heavly customized our zencart, too. here goes the details two problems.

1) I logged in with IE explorer and went to the shipping address page in the process of checkout, when I clicked some space on the page, the page went to straight to http://www.healthcabin.net/accessori...sale-1040.html. the page went to other category when i deleted the category of 1040. how should i do?

2) when i logged in and used coupon, there was a Warning: Division by zero in
/home/content/e/c/i/ecigarette/html/includes/modules/order_total/ot_coupon.php on line 364. at the same time the page looked strange.

my website is www.healthcabin.net
test account: [email protected]，password：123456

hope to get help. thanks in advance!