First off, please stop the node asap. It started a new setup instead of continuing with your existing data. Any data sent to this new node may later be lost, so please stop it first.
Next please take a look at the current instructions for running your node. The issue you are facing is likely caused by the use of the -v mounting option that was listed in early instructions. This setting is dangerous as when the storage location is not available for some reason, docker instead stores data inside the container, which could lead to data loss. Please remove your container and recreate it using the new instructions found here.
If the above does not apply, please post your current run command so we can have a look what else might be wrong.