Can't delete a content in workspace

I assume it is NOT the classic workspace as I don't see any other to change to classic workspace.

I also clear the broweser cache and it is the same. I use Edge and Chrome which is the same.

The report I tried to delete is not included in app or template. The way I created it in the first place is to publish to a workspace first, then save the content as a copy to another workspace. The the copy in the other workspace need to be deleted.

The other insteresting finding is when I made change in Desktop and  republish the new report to service, It said 4 workspace and 6 reports to be replaced. I actually has 3 workspaces and 4 reports to be upated. Not only that, after I publish the all the apps in service, the other two apps which are derived from the copied contents are not updated at all. Looks like this is a ghost report.