To increase efficiency in the platform, we have introduced logic where the system will remember previously used selections. In particular, this applies to selections you make under the "Site Name" field.
This logic can be demonstrated by registering an asset under the Boston site.
Next time we register an asset (it can be under a different category than the previously registered asset), the site "Boston" will hold for the second asset.
The site "Boston" will hold for an unlimited amount of times you register assets in the future until you register an asset under a different site.