I have columns in one of my apps that keeps creating themselves
I delete them and it comes back.
They are duplicates of others and have Type as DOUBLE
the app ID is 67638E47-9916-DD4F-FFCF-6EF84F09F600
When you save an object in the database, properties in the saved object will translate to the corresponding columns in the data table. If a property does not have a corresponding column, the column will be created if Dynamic Schema Definition is enabled. To cancel that behavior, you would need to disable Dynamic Schema Definition as shown in the linked page from the docs.
Regards,
Mark