Online Cart Pilfering

Today I attempted to purchase [URL Removed] through the online store and added it to my basket in the morning. When attempting to check out I was unable due to being out of stock.<br> <br> Why is a product able to go out of stock when I have reserved one and put it in my online cart?<br> <br> This is the equivalent of someone taking a product from my trolley while I am paying for it when I am in a store, this issue needs to be addressed and my product should be put back into the cart.<br> <br> Thank you.