In the Unity toolbar, select
DataMaster -> Reload Databases. While this should happen automatically, this option exists to manually reload the databases.
If you are still experiencing issues, we recommend re-importing your project via
Assets -> Reimport All.
Each catalog only needs a single database definition and asset. If you have multiple, you can safely delete duplicates. You can also choose to delete all of them and have DataMaster recreate them for you using
DataMaster -> Reload Databases.