The issue is also described on Magento Bug-track (still not answered): http://www.magentocommerce.com/bug-tracking/issue/index/id/443
Steps to reproduce:
I have created a configurable product consisting of 3 Simple products (hidden individually) with different Stock quantities. When looking at the frontend and having the option: "Only X left" displayed, the quantity is correct. When I expand to display the details, the table is displayed but does not contain the names of the individual Simple products. I have tested this with a clean install of 220.127.116.11 which works correctly I have tested this with a clean install of 18.104.22.168 and the information is missing.
Only X left table in the frontend with a breakdown of the Name of the Simple products per row and the Qty of that product in the column behind it Actual Result: Only X left table in the frontend consists of the correct amount of rows and columns. The name column does not display the product name, the Qty column displays the correct information.
Does anyone know how to fix this bug?
This is how it looks like in Magento 22.214.171.124:
And this is how it should look like (from Magento 126.96.36.199):