When using a circle or an arc in a template component, the software is building linestrings on default level in the 3d model.
It is possible to turn off these lines if the Null Point Linear Feature Option is set to False in the template feature definition.
But you may need this option to be on True for other reasons, the symbology of these elements should be accessible for the user to update, preferably under each component settings.
Also these lines should not display of the component display if OFF, which they do at the moment.