Status/Line Chart issues

Status or line chart panels not showing values of all query configuration for the time period last 12 hours and below ? It shows only updated queries it is not maintaining fill(previous) configuration

As per the screen, I have added 3 queries all of which are configured to fill (previous) when i select time range of the last 12 hours and below it shows only updated 1 query and if there is no change, it shows no data