Puff Pastry - Simple Saturday

I have a question?? - anyone know why my puff pastry puffs up so nicely sometimes, and other times it's almost flat or somewhere in between? It's all made with the same brand frozen puff pastry so it couldn't be something different I've done with the recipe, and it all tastes just fine too, just different degrees of puffiness - Any ideas?

If you have a simple puff pastry recipe I'd love for you to share it with us here. If not, any simple recipe will do just fine. I can't wait to see what you have to show us this week!