Child variable is not updating automatically when parent variable is updated

Hello, can you help me check? I have two variables. Parent and Child. When I change the parent, child variable isn’t refreshing automatically. I have to refresh the whole page to see the new values.

When I select a new ‘Group’, the Cluster should show all the members of the selected group.

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After page reload, this is now the value of ‘Cluster’

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$Group - netapp.perf.*
$Cluster - netapp.perf.$Group.*

Update: When selecting more than one ‘group’, the field ‘Cluster’ is automatically adjusted.

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Grafana version: v4.3.2
Data Source: Graphite