Stock by Attribute 4.7 & ZC 1.3.8 - check stock before adding to cart

Stock settigs are as follows:

Check stock level true
Subtract stock true
Allow Checkout false
Mark product out of stock ***
Stock Re-order level 5
Show available stock level in cart when less than order true
Products status in Catalog when out of stock should be set to 0
Show Sold Out Image in place of Add to Cart 1
Product Quantity Decimals 0
Show Shopping Cart - Delete Checkboxes or Delete Button 3
Show Shopping Cart - Update Cart Button Location 3
Show New Products on empty Shopping Cart Page 1
Show Featured Products on empty Shopping Cart Page 2
Show Special Products on empty Shopping Cart Page 3
Show Upcoming Products on empty Shopping Cart Page 4
Show Notice of Combining Shopping Cart on Login 1

I have an item called "geekshirt" which has attribs for size (large/XL) and color (Brown/Black) for each size. I have allocated stock 10 for Lg brown and stock 15 for small black. The items shows stock of 25 and allows me to put sizes and colors what I do not have stock of in the cart.

What am i missing? Souldnt this inventory be checked? I've been all through this forum and havent seen any posts that seem to apply to this issue. Any and all help would be most helpful.

The cart can be viewed / tested at https://www.tkservices.com/temp/cart and there is only 1 tshirt that i have added to the demo inventory.

Thanks!