Please take a look at http://www.bestvapestore.com/product/goblin-juice-krazak/
All variations are out of stock, but as you can see, when switching between them it shows the Add to Cart button briefly - this is not desirable. I'm using a theme and can't seem to find the code responsible for this.
There is also an issue when no variation is selected, and then a user selects an out of stock variation. It doesn't quite show the add to cart button, but it displays some content after the 'out of stock' message briefly before displaying correctly.
Cany anyone help?