We have reports that have filters for periods (Year-Month) and when we have to update to the next months data, the dashboard tiles do not reflect that data. I was able to create a test dashboard and replicate this issue. For example, the tiles were all showing the correct data for the month of August. Once september came, I changed the period filter to september and when it was published the Tile values did not change. The tiles refresh without issues everyday throughout the month but do not once this filter is changed.
As a workaround I have to remember to delete and repin all of the visuals in the begining of each month, basically recreating the dashboard, which is very time consuming.