Sort on name in stack display incorrect

I have the following stacks:

client-a-test-area client-a-test-area-eu-west-2-app-1 client-a-test-area-eu-west-2-app-2,client-a-test-area-eu-west-2, client-a-test

setting sort=name & sortDirection=ASC results in
client-a-test

client-a-test-area-eu-west-2

client-a-test-area-eu-west-2-app-1

client-a-test-area-eu-west-2-app-2

client-a-test-area

setting sort=name & sortDirection=DESC results in

client-a-test-area

client-a-test-area-eu-west-2-app-1

client-a-test-area-eu-west-2-app-2

client-a-test-area-eu-west-2

client-a-test

As can been seen neither of these sort orders are correct