The gauge and metric visualizations in Time Series Visual Builder only show the "last bucket" of the aggregation that powers them, it doesn't automatically sum up the values for the entire time range selected in the time picker. I'm guessing if you look in the Panel Options of these visualizations the "interval" will be set to "auto". That means if you've selected a 15 minute time range, it's probably picking a 1 minute interval or something like that, which means the value you're seeing in the visualization is only the value from the last minute. This would explain why they seem to work inconsistently, sometimes you've got data for the last minute, sometimes not. You might have to play around with the "interval" and "drop last bucket" options to find something that works well for your use case.
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