Grafana saved dashboard's data vanishing

Using grafana, Influxdb and WorldMap plugin I have created a dashboard with corona data available on the net. The data was shown the dashboard and I have saved the dashboard given a name. Before logout I have checked and could view
worldmap_withData01


it. Next day when I open the same dashboard, only the background worldmap is there but the data is gone. What mistake I am making? I have just started using grafana and Influxdb. I have checked, the influxdb server was running. The threshold I have set for the data is on the dashboard, but the data is gone!