Variant Selector Not Updating Dynamically

[colinashvin]

My store has product variants such that the 12cm and 14cm size variants have Standard and Premium Quality, whereas only 13.5cm size variant has Insulated and Double Function Quality variant.

Take a look at the product page: https://www.bdari.my/collections/all/products/peony

When I switch from 12cm to 13.5cm, it does not dynamically scratch out Standard and Premium and show Insulated and Double Function as available, as it should.

But when I select on 13.5cm first and then select on either Insulated or Double Function, it dynamically and correctly makes the other two options unavailable.

So, it updates only when the Quality variants are switched.