“Forget” selected data if that group gets hidden again

[select* choose-group first_as_label "Pick a group, 1 or 2" "Group 1" "Group 2"]

[group group-1]
	[select first-group "1 - red" "1 - blue"]
[/group]

[group group-2]
	[select second-group "2 - red" "2 - blue"]
[/group]

A user selects the “Group 2” first, then from “group-2” selects “2 – blue”
If he then selects “Group 1”, the previous selection gets hidden, he then selects “1 – red”
After submitting the data will show “2 – blue” and not “1 – red”. Is there a way to clear the selection when it gets hidden? If he doesn’t click send, but just switches back to “Group 2” he will already have the selection “2 – blue” selected (because it was remembered)

I hope it isn’t too confusing. Great plugin btw!