"No Data" issues when changing time frame of the data requested

I’ve been importing data from SQL17 to create graphs. The SQL data sets are being constantly updated by the machines they are recording. My issue comes when I try to change the time frame of the data set. We know that the data is populated at these times but it still will not show or only shows a small portion of the data. For example, If I select to show last 6 hrs, the graph will scale to 6 hrs but data will only appear over the 5th hr of that time frame while all that data appears when I chose “last 12 hrs” or “last 24 hrs”

I’m seeing something similar - I have weeks of data on a certain set of metrics. “Last 2 days” works fine in my dashboard, but when I go beyond that, some of the data (but not all) vanishes.