If you recently logged back in and it looks like all your data went missing, please consider whether you have set up an account under another email address. You may also have set up an account via "Login with Facebook" or "Apple ID" in addition to an email address.
99% of the time this heart-stopping moment is resolved by identifying the right account. If you need help with this, please get in touch.
If you're regularly being logged out and data is not saving, please check whether your phone is low on space. Huckleberry does not require a lot of space, so typically deleting a few old videos you no longer need will do the trick.