It's possible that the issue you're experiencing with empty dashboard tiles is related to changes in your data or your report over time. If your data source has changed or if there have been changes to the report itself (such as updates to visuals or filters), this could cause some tiles to no longer display data.
One thing you can try is to refresh the data in your report to see if that resolves the issue. To do this, you can click on the "Refresh" button in the top-right corner of the Power BI Desktop or Service interface. This will refresh the data in your report and may cause the tiles to display the correct values.
If refreshing the data does not resolve the issue, you can try checking the data source for any issues. If your data source is a database or other external data source, there may be issues with the connection or with the data itself. In this case, you may need to work with your IT team or the provider of the data source to resolve the issue.
