Appreciate the feedback, Emma! Apologies that your Caliburn A2 isn't performing as intended - we understand a leaking vape can be quite frustrating! The cause of leaking can be from a range of factors; a warped pod, overheating or misfiring to name a few.
My first recommendation would be to replace the pod and monitor the leaking from there. Additionally, we always recommend charging your vape with the pod removed from the device, as the charging process can sometimes cause the e-liquid inside the pod to warm up and thin out, causing it to leak.
If leaking is still occurring, please come and visit us in-store! We'd be more than happy to troubleshoot the device for you and find a resolution.
Thanks again for the feedback, it's always appreciated! (: