Graph doesn't show updated data

For a line graph, I’m looking at the past 6 hours (from: now-6h, to: now).

Sometimes, when the data is still filling up, there is a sharp drop in the graph (data still hasn’t been receieved), like below. If I set the time interval to be “from: now-6h, to:now-2m” to try to get rid of that drop, the drop still shows. It’s as if it goes back in time 2 minutes when the data was still being filled then. Any way to remedy this problem? I appreciate any and all help, as I am quite new to Grafana. Thanks!