Missing Product Option Choice on Product Page

I have searched, and am not finding an answer to this problem. I apologize in advance if it's there and I just can't find it. I've read the documentation as well.

http://trendyteeshopping.com/shop/index.php?dispatch=categories.view&category_id=166 - is where I'm having problems (all of the t-shirts, actually). If I click quick view, the choice for size shows. If I add it, it shows in the view cart - but the actual product page does not allow for selection of size.

I have deleted, started over, still, does not show. Any help/guidance would be appreciated, or pointing out where it is in the documentation.

Thank you in advance.

Seems ok for me