Add to Cart, sometime SSL sometimes not

I con't figure this out. Most products, when clicking add to cart, stay with the unsecure site. I've got Zen set to not show the shopping cart, so the product page reloads, just as it should. Some products, when clicking add to cart, reload the product due do so using https.

Why the difference? I need it to stay http.

Is there only specific products that exhibit this?

I could not get it to switch adding the few that I did

Is seems to be category related. Most work fine but the NFL, NBA abd MLB towels seem to do it.

For example, http://www.customcreationsunlimited.com/photo-beach-towels-2/nba-beach-towels-188/atlanta-hawks-189/atlanta-hawks-personalized-golf-towel-807.html

Does this one switch the SSL for you?

Yeah, initially I was at the site in your sig....

I do see this and have no explanation for this action...
You might try switching to the classic template to see if it is template related and if so review your override/custom template edits

Thanks for helping out. I had my host restart the SSL and the problem went away.