I have tried a few different Back In Stock apps recently, and one of them (not sure which) has changed my theme coding so that my add to cart button is no longer hidden when an item is out of stock. So when an item is out of stock it shows both the add to cart button and the Back In Stock notification sign up box. Of course each of the app developers and my theme developer are unwilling to help, with each blaming someone else. I'm guessing and hoping it's a relatively simple fix?! This is the current add to cart code:
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