When a Dashboard object (DASH) is imported, it initially always becomes a Public Dashboard. If the user wants the object to be only in My Dashboards it has to be moved.
This is expected bahavior
Release: AUTARA99000-12.2-Automic-ARA for Agents
Workaround: Move the Dashboard to My Dashboards if needed.
The following has been added to the documentation:
When you create a dashboard, you can specify if it is private or public. To change a dashboard definition, right-click its name on the left pane, and select Move to My Dashboards or Move to Public Dashboards.
Important! If you export a Dashboard object from My Dashboards, and then later decide to import the object, the Dashboard will always appear in the Public Dashboards. Therefore you will have to Move to My Dashboards (as described above).