We use Time series graph and Image overlay for our data visualisation.
With both types, data can be selected on aggregation.
When aggregation ‘Last’ is chosen on a Time series, data is visible only for the last 7 days.
If instead aggregation is set to ‘Max’ for example, all data from the last 30 days is visible.
The same thing happens with an Image overlay.
When you pick a date/time for the dashboard, incorrect data is displayed on the image overlay if aggregation is set to ‘Last’ and the date/time is more than 7 days ago.
I’ve made a temporary time series graph with 2 graph sourced from the same data, only aggregation is different. You can see one graph extends for 30 days while the other only shows data from the last 7 days.