Several factors may affect the popping mechanism of the cubes. If you’re able to capture it on video with the recipient opening the PopBox, please contact our Customer Care team as it can help us determine what could have gone wrong on our end. We’re always here to help! Please note that the longer PopBox is sitting waiting to be gifted, the less likely it is to pop as well. We recommend gifting it immediately, or waiting no more than 2 weeks to gift. Note: Our customer care team may use their own discretion to determine what is considered as “pops” and what aren’t. Delays in pops are to be expected sometimes and often are not determined as defective products.