Puff pastry must not proof. First, as mentioned, because it contains no yeast, it is entirely steam leavened. For that reason, if you allow it to sit at room temp for any amount of time, its fats begin to break down and lose water. Conversely, it needs to be refrigerated for at least 30 minutes after its final shaping before being baked. And because it is steam leavened, it needs to be baked at a high temperature - 425 degrees or higher. What are you making?
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Puff pastry should go straight from the fridge to the oven, as the cold butter turning to steam ASAP creates the layers.