Amount in order_spec should be 8, not 9.
Amount in order_spec should be 8, not 9.

Look at the setup at the top to see why

spree-contrib/spree_volume_pricing,solidusio-contrib/solidus_volume_pricing,solidusio-contrib/solidus_volume_pricing,jspizziri/spree_volume_pricing,spree-contrib/spree_volume_pricing,solidusio-contrib/solidus_volume_pricing,redglory/spree_volume_pricing,jspizziri/spree_volume_pricing,redglory/spree_volume_pricing,redglory/spree_volume_pricing,jspizziri/spree_volume_pricing,solidusio-contrib/solidus_volume_pricing,spree-contrib/spree_volume_pricing