Calendar view sheet published to share on dashboard - unable to update?

I have a sheet in Calendar View that I have published to add to a dashboard. I've added to the sheet, but find when I try to refresh or republish the sheet (and editing the web source widget), the changes will not show on the dashboard. I can see the changes in my sheet in Calendar view, have refreshed, have saved, have published again, but I'm still not seeing the changes. I have deleted the widget from the dashboard and added it as a new widget - still can't see the changes I made. No filters are on. Has anyone else had this experience?

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