Hi @Alberto_Nieto -
This behaviour is occurring because the filter is being applied before the array is unwound. Basically it’s filtering for documents where the array contains the expected values (in addition to other values) and then it’s unwinding all values to show on the chart.
To get the behaviour you want you need to move the array unwind before the filter. To do this you need to use the query bar, e.g. by specifying:
[{$unwind: "$data"}]
And then the filter will apply to the unwound values, filtering out anything you don’t want.