Bazarre issue creating a Dashboard

Rookie needs help creating dashboard. Seems simple but for me it’s not.
I’m trying to create a dashboard. All is going well in edit mode

However, when I save it, the dashboard comes up blank.

Can anyone explain what I’m doing wrong?

Thank You

Some questions - Did you apply any visibility requirements in the settings of the dashboard or card? Did you apply a theme? Did you refresh your browser and browser cache?

No. Ironically, when I revisited the page a couple of hours later, it was populated and visible. Go figure.